feat: add mixed-channel precheck API for account-group binding

Add a dedicated CheckMixedChannel endpoint that allows the frontend
to pre-validate mixed channel risk before submitting create/update
requests. This improves UX by showing warnings earlier in the flow
instead of only after form submission.

Backend changes:
- Add CheckMixedChannelRequest struct and CheckMixedChannel handler
- Register POST /check-mixed-channel route
- Expose CheckMixedChannelRisk as public method on AdminService
- Simplify Create/Update 409 responses (remove details/require_confirmation)
- Add comprehensive handler tests and stub methods

Frontend changes:
- Add checkMixedChannelRisk API function and TypeScript types
- Refactor CreateAccountModal to precheck before step transition and submission
- Refactor EditAccountModal to precheck before update submission
- Replace pendingPayload pattern with action-based dialog flow

backend/internal/handler/admin/account_handler.go

@@ -139,6 +139,13 @@ type BulkUpdateAccountsRequest struct {
 	ConfirmMixedChannelRisk *bool          `json:"confirm_mixed_channel_risk"` // 用户确认混合渠道风险
 }
 
+// CheckMixedChannelRequest represents check mixed channel risk request
+type CheckMixedChannelRequest struct {
+	Platform  string  `json:"platform" binding:"required"`
+	GroupIDs  []int64 `json:"group_ids"`
+	AccountID *int64  `json:"account_id"`
+}
+
 // AccountWithConcurrency extends Account with real-time concurrency info
 type AccountWithConcurrency struct {
 	*dto.Account
@@ -389,6 +396,50 @@ func (h *AccountHandler) GetByID(c *gin.Context) {
 	response.Success(c, h.buildAccountResponseWithRuntime(c.Request.Context(), account))
 }
 
+// CheckMixedChannel handles checking mixed channel risk for account-group binding.
+// POST /api/v1/admin/accounts/check-mixed-channel
+func (h *AccountHandler) CheckMixedChannel(c *gin.Context) {
+	var req CheckMixedChannelRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	if len(req.GroupIDs) == 0 {
+		response.Success(c, gin.H{"has_risk": false})
+		return
+	}
+
+	accountID := int64(0)
+	if req.AccountID != nil {
+		accountID = *req.AccountID
+	}
+
+	err := h.adminService.CheckMixedChannelRisk(c.Request.Context(), accountID, req.Platform, req.GroupIDs)
+	if err != nil {
+		var mixedErr *service.MixedChannelError
+		if errors.As(err, &mixedErr) {
+			response.Success(c, gin.H{
+				"has_risk": true,
+				"error":    "mixed_channel_warning",
+				"message":  mixedErr.Error(),
+				"details": gin.H{
+					"group_id":         mixedErr.GroupID,
+					"group_name":       mixedErr.GroupName,
+					"current_platform": mixedErr.CurrentPlatform,
+					"other_platform":   mixedErr.OtherPlatform,
+				},
+			})
+			return
+		}
+
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"has_risk": false})
+}
+
 // Create handles creating a new account
 // POST /api/v1/admin/accounts
 func (h *AccountHandler) Create(c *gin.Context) {
@@ -431,17 +482,10 @@ func (h *AccountHandler) Create(c *gin.Context) {
 		// 检查是否为混合渠道错误
 		var mixedErr *service.MixedChannelError
 		if errors.As(err, &mixedErr) {
-			// 返回特殊错误码要求确认
+			// 创建接口仅返回最小必要字段，详细信息由专门检查接口提供
 			c.JSON(409, gin.H{
 				"error":   "mixed_channel_warning",
 				"message": mixedErr.Error(),
-				"details": gin.H{
-					"group_id":         mixedErr.GroupID,
-					"group_name":       mixedErr.GroupName,
-					"current_platform": mixedErr.CurrentPlatform,
-					"other_platform":   mixedErr.OtherPlatform,
-				},
-				"require_confirmation": true,
 			})
 			return
 		}
@@ -501,17 +545,10 @@ func (h *AccountHandler) Update(c *gin.Context) {
 		// 检查是否为混合渠道错误
 		var mixedErr *service.MixedChannelError
 		if errors.As(err, &mixedErr) {
-			// 返回特殊错误码要求确认
+			// 更新接口仅返回最小必要字段，详细信息由专门检查接口提供
 			c.JSON(409, gin.H{
 				"error":   "mixed_channel_warning",
 				"message": mixedErr.Error(),
-				"details": gin.H{
-					"group_id":         mixedErr.GroupID,
-					"group_name":       mixedErr.GroupName,
-					"current_platform": mixedErr.CurrentPlatform,
-					"other_platform":   mixedErr.OtherPlatform,
-				},
-				"require_confirmation": true,
 			})
 			return
 		}

backend/internal/handler/admin/account_handler_mixed_channel_test.go

+package admin
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func setupAccountMixedChannelRouter(adminSvc *stubAdminService) *gin.Engine {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	accountHandler := NewAccountHandler(adminSvc, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+	router.POST("/api/v1/admin/accounts/check-mixed-channel", accountHandler.CheckMixedChannel)
+	router.POST("/api/v1/admin/accounts", accountHandler.Create)
+	router.PUT("/api/v1/admin/accounts/:id", accountHandler.Update)
+	return router
+}
+
+func TestAccountHandlerCheckMixedChannelNoRisk(t *testing.T) {
+	adminSvc := newStubAdminService()
+	router := setupAccountMixedChannelRouter(adminSvc)
+
+	body, _ := json.Marshal(map[string]any{
+		"platform":  "antigravity",
+		"group_ids": []int64{27},
+	})
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/admin/accounts/check-mixed-channel", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+	var resp map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, float64(0), resp["code"])
+	data, ok := resp["data"].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, false, data["has_risk"])
+	require.Equal(t, int64(0), adminSvc.lastMixedCheck.accountID)
+	require.Equal(t, "antigravity", adminSvc.lastMixedCheck.platform)
+	require.Equal(t, []int64{27}, adminSvc.lastMixedCheck.groupIDs)
+}
+
+func TestAccountHandlerCheckMixedChannelWithRisk(t *testing.T) {
+	adminSvc := newStubAdminService()
+	adminSvc.checkMixedErr = &service.MixedChannelError{
+		GroupID:         27,
+		GroupName:       "claude-max",
+		CurrentPlatform: "Antigravity",
+		OtherPlatform:   "Anthropic",
+	}
+	router := setupAccountMixedChannelRouter(adminSvc)
+
+	body, _ := json.Marshal(map[string]any{
+		"platform":   "antigravity",
+		"group_ids":  []int64{27},
+		"account_id": 99,
+	})
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/admin/accounts/check-mixed-channel", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+	var resp map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, float64(0), resp["code"])
+	data, ok := resp["data"].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, true, data["has_risk"])
+	require.Equal(t, "mixed_channel_warning", data["error"])
+	details, ok := data["details"].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, float64(27), details["group_id"])
+	require.Equal(t, "claude-max", details["group_name"])
+	require.Equal(t, "Antigravity", details["current_platform"])
+	require.Equal(t, "Anthropic", details["other_platform"])
+	require.Equal(t, int64(99), adminSvc.lastMixedCheck.accountID)
+}
+
+func TestAccountHandlerCreateMixedChannelConflictSimplifiedResponse(t *testing.T) {
+	adminSvc := newStubAdminService()
+	adminSvc.createAccountErr = &service.MixedChannelError{
+		GroupID:         27,
+		GroupName:       "claude-max",
+		CurrentPlatform: "Antigravity",
+		OtherPlatform:   "Anthropic",
+	}
+	router := setupAccountMixedChannelRouter(adminSvc)
+
+	body, _ := json.Marshal(map[string]any{
+		"name":        "ag-oauth-1",
+		"platform":    "antigravity",
+		"type":        "oauth",
+		"credentials": map[string]any{"refresh_token": "rt"},
+		"group_ids":   []int64{27},
+	})
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPost, "/api/v1/admin/accounts", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusConflict, rec.Code)
+	var resp map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, "mixed_channel_warning", resp["error"])
+	require.Contains(t, resp["message"], "mixed_channel_warning")
+	_, hasDetails := resp["details"]
+	_, hasRequireConfirmation := resp["require_confirmation"]
+	require.False(t, hasDetails)
+	require.False(t, hasRequireConfirmation)
+}
+
+func TestAccountHandlerUpdateMixedChannelConflictSimplifiedResponse(t *testing.T) {
+	adminSvc := newStubAdminService()
+	adminSvc.updateAccountErr = &service.MixedChannelError{
+		GroupID:         27,
+		GroupName:       "claude-max",
+		CurrentPlatform: "Antigravity",
+		OtherPlatform:   "Anthropic",
+	}
+	router := setupAccountMixedChannelRouter(adminSvc)
+
+	body, _ := json.Marshal(map[string]any{
+		"group_ids": []int64{27},
+	})
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/accounts/3", bytes.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusConflict, rec.Code)
+	var resp map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, "mixed_channel_warning", resp["error"])
+	require.Contains(t, resp["message"], "mixed_channel_warning")
+	_, hasDetails := resp["details"]
+	_, hasRequireConfirmation := resp["require_confirmation"]
+	require.False(t, hasDetails)
+	require.False(t, hasRequireConfirmation)
+}

backend/internal/handler/admin/admin_service_stub_test.go

@@ -10,19 +10,27 @@ import (
 )
 
 type stubAdminService struct {
-	users           []service.User
-	apiKeys         []service.APIKey
-	groups          []service.Group
-	accounts        []service.Account
-	proxies         []service.Proxy
-	proxyCounts     []service.ProxyWithAccountCount
-	redeems         []service.RedeemCode
-	createdAccounts []*service.CreateAccountInput
-	createdProxies  []*service.CreateProxyInput
-	updatedProxyIDs []int64
-	updatedProxies  []*service.UpdateProxyInput
-	testedProxyIDs  []int64
-	mu              sync.Mutex
+	users            []service.User
+	apiKeys          []service.APIKey
+	groups           []service.Group
+	accounts         []service.Account
+	proxies          []service.Proxy
+	proxyCounts      []service.ProxyWithAccountCount
+	redeems          []service.RedeemCode
+	createdAccounts  []*service.CreateAccountInput
+	createdProxies   []*service.CreateProxyInput
+	updatedProxyIDs  []int64
+	updatedProxies   []*service.UpdateProxyInput
+	testedProxyIDs   []int64
+	createAccountErr error
+	updateAccountErr error
+	checkMixedErr    error
+	lastMixedCheck   struct {
+		accountID int64
+		platform  string
+		groupIDs  []int64
+	}
+	mu sync.Mutex
 }
 
 func newStubAdminService() *stubAdminService {
@@ -188,11 +196,17 @@ func (s *stubAdminService) CreateAccount(ctx context.Context, input *service.Cre
 	s.mu.Lock()
 	s.createdAccounts = append(s.createdAccounts, input)
 	s.mu.Unlock()
+	if s.createAccountErr != nil {
+		return nil, s.createAccountErr
+	}
 	account := service.Account{ID: 300, Name: input.Name, Status: service.StatusActive}
 	return &account, nil
 }
 
 func (s *stubAdminService) UpdateAccount(ctx context.Context, id int64, input *service.UpdateAccountInput) (*service.Account, error) {
+	if s.updateAccountErr != nil {
+		return nil, s.updateAccountErr
+	}
 	account := service.Account{ID: id, Name: input.Name, Status: service.StatusActive}
 	return &account, nil
 }
@@ -224,6 +238,13 @@ func (s *stubAdminService) BulkUpdateAccounts(ctx context.Context, input *servic
 	return &service.BulkUpdateAccountsResult{Success: 1, Failed: 0, SuccessIDs: []int64{1}}, nil
 }
 
+func (s *stubAdminService) CheckMixedChannelRisk(ctx context.Context, currentAccountID int64, currentAccountPlatform string, groupIDs []int64) error {
+	s.lastMixedCheck.accountID = currentAccountID
+	s.lastMixedCheck.platform = currentAccountPlatform
+	s.lastMixedCheck.groupIDs = append([]int64(nil), groupIDs...)
+	return s.checkMixedErr
+}
+
 func (s *stubAdminService) ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]service.Proxy, int64, error) {
 	search = strings.TrimSpace(strings.ToLower(search))
 	filtered := make([]service.Proxy, 0, len(s.proxies))

backend/internal/server/routes/admin.go

@@ -219,6 +219,7 @@ func registerAccountRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 		accounts.GET("", h.Admin.Account.List)
 		accounts.GET("/:id", h.Admin.Account.GetByID)
 		accounts.POST("", h.Admin.Account.Create)
+		accounts.POST("/check-mixed-channel", h.Admin.Account.CheckMixedChannel)
 		accounts.POST("/sync/crs", h.Admin.Account.SyncFromCRS)
 		accounts.POST("/sync/crs/preview", h.Admin.Account.PreviewFromCRS)
 		accounts.PUT("/:id", h.Admin.Account.Update)

backend/internal/service/admin_service.go

@@ -54,6 +54,7 @@ type AdminService interface {
 	SetAccountError(ctx context.Context, id int64, errorMsg string) error
 	SetAccountSchedulable(ctx context.Context, id int64, schedulable bool) (*Account, error)
 	BulkUpdateAccounts(ctx context.Context, input *BulkUpdateAccountsInput) (*BulkUpdateAccountsResult, error)
+	CheckMixedChannelRisk(ctx context.Context, currentAccountID int64, currentAccountPlatform string, groupIDs []int64) error
 
 	// Proxy management
 	ListProxies(ctx context.Context, page, pageSize int, protocol, status, search string) ([]Proxy, int64, error)
@@ -2114,6 +2115,11 @@ func (s *adminServiceImpl) checkMixedChannelRisk(ctx context.Context, currentAcc
 	return nil
 }
 
+// CheckMixedChannelRisk checks whether target groups contain mixed channels for the current account platform.
+func (s *adminServiceImpl) CheckMixedChannelRisk(ctx context.Context, currentAccountID int64, currentAccountPlatform string, groupIDs []int64) error {
+	return s.checkMixedChannelRisk(ctx, currentAccountID, currentAccountPlatform, groupIDs)
+}
+
 func (s *adminServiceImpl) attachProxyLatency(ctx context.Context, proxies []ProxyWithAccountCount) {
 	if s.proxyLatencyCache == nil || len(proxies) == 0 {
 		return

frontend/src/api/admin/accounts.ts

@@ -15,7 +15,9 @@ import type {
   AccountUsageStatsResponse,
   TempUnschedulableStatus,
   AdminDataPayload,
-  AdminDataImportResult
+  AdminDataImportResult,
+  CheckMixedChannelRequest,
+  CheckMixedChannelResponse
 } from '@/types'
 
 /**
@@ -133,6 +135,16 @@ export async function update(id: number, updates: UpdateAccountRequest): Promise
   return data
 }
 
+/**
+ * Check mixed-channel risk for account-group binding.
+ */
+export async function checkMixedChannelRisk(
+  payload: CheckMixedChannelRequest
+): Promise<CheckMixedChannelResponse> {
+  const { data } = await apiClient.post<CheckMixedChannelResponse>('/admin/accounts/check-mixed-channel', payload)
+  return data
+}
+
 /**
  * Delete account
  * @param id - Account ID
@@ -535,6 +547,7 @@ export const accountsAPI = {
   getById,
   create,
   update,
+  checkMixedChannelRisk,
   delete: deleteAccount,
   toggleStatus,
   testAccount,

frontend/src/components/account/CreateAccountModal.vue

@@ -2157,7 +2157,7 @@
   <ConfirmDialog
     :show="showMixedChannelWarning"
     :title="t('admin.accounts.mixedChannelWarningTitle')"
-    :message="mixedChannelWarningDetails ? t('admin.accounts.mixedChannelWarning', mixedChannelWarningDetails) : ''"
+    :message="mixedChannelWarningMessageText"
     :confirm-text="t('common.confirm')"
     :cancel-text="t('common.cancel')"
     :danger="true"
@@ -2189,7 +2189,14 @@ import {
 import { useOpenAIOAuth } from '@/composables/useOpenAIOAuth'
 import { useGeminiOAuth } from '@/composables/useGeminiOAuth'
 import { useAntigravityOAuth } from '@/composables/useAntigravityOAuth'
-import type { Proxy, AdminGroup, AccountPlatform, AccountType } from '@/types'
+import type {
+  Proxy,
+  AdminGroup,
+  AccountPlatform,
+  AccountType,
+  CheckMixedChannelResponse,
+  CreateAccountRequest
+} from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import ConfirmDialog from '@/components/common/ConfirmDialog.vue'
 import Icon from '@/components/icons/Icon.vue'
@@ -2338,10 +2345,13 @@ const getTempUnschedRuleKey = createStableObjectKeyResolver<TempUnschedRuleForm>
 const geminiOAuthType = ref<'code_assist' | 'google_one' | 'ai_studio'>('google_one')
 const geminiAIStudioOAuthEnabled = ref(false)
 
-// Mixed channel warning dialog state
 const showMixedChannelWarning = ref(false)
-const mixedChannelWarningDetails = ref<{ groupName: string; currentPlatform: string; otherPlatform: string } | null>(null)
-const pendingCreatePayload = ref<any>(null)
+const mixedChannelWarningDetails = ref<{ groupName: string; currentPlatform: string; otherPlatform: string } | null>(
+  null
+)
+const mixedChannelWarningRawMessage = ref('')
+const mixedChannelWarningAction = ref<(() => Promise<void>) | null>(null)
+const antigravityMixedChannelConfirmed = ref(false)
 const showAdvancedOAuth = ref(false)
 const showGeminiHelpDialog = ref(false)
 
@@ -2379,6 +2389,13 @@ const isOpenAIModelRestrictionDisabled = computed(() =>
   form.platform === 'openai' && openaiPassthroughEnabled.value
 )
 
+const mixedChannelWarningMessageText = computed(() => {
+  if (mixedChannelWarningDetails.value) {
+    return t('admin.accounts.mixedChannelWarning', mixedChannelWarningDetails.value)
+  }
+  return mixedChannelWarningRawMessage.value
+})
+
 const geminiQuotaDocs = {
   codeAssist: 'https://developers.google.com/gemini-code-assist/resources/quotas',
   aiStudio: 'https://ai.google.dev/pricing',
@@ -2795,6 +2812,105 @@ const splitTempUnschedKeywords = (value: string) => {
     .filter((item) => item.length > 0)
 }
 
+const needsMixedChannelCheck = (platform: AccountPlatform) => platform === 'antigravity' || platform === 'anthropic'
+
+const buildMixedChannelDetails = (resp?: CheckMixedChannelResponse) => {
+  const details = resp?.details
+  if (!details) {
+    return null
+  }
+  return {
+    groupName: details.group_name || 'Unknown',
+    currentPlatform: details.current_platform || 'Unknown',
+    otherPlatform: details.other_platform || 'Unknown'
+  }
+}
+
+const clearMixedChannelDialog = () => {
+  showMixedChannelWarning.value = false
+  mixedChannelWarningDetails.value = null
+  mixedChannelWarningRawMessage.value = ''
+  mixedChannelWarningAction.value = null
+}
+
+const openMixedChannelDialog = (opts: {
+  response?: CheckMixedChannelResponse
+  message?: string
+  onConfirm: () => Promise<void>
+}) => {
+  mixedChannelWarningDetails.value = buildMixedChannelDetails(opts.response)
+  mixedChannelWarningRawMessage.value =
+    opts.message || opts.response?.message || t('admin.accounts.failedToCreate')
+  mixedChannelWarningAction.value = opts.onConfirm
+  showMixedChannelWarning.value = true
+}
+
+const withAntigravityConfirmFlag = (payload: CreateAccountRequest): CreateAccountRequest => {
+  if (needsMixedChannelCheck(payload.platform) && antigravityMixedChannelConfirmed.value) {
+    return {
+      ...payload,
+      confirm_mixed_channel_risk: true
+    }
+  }
+  const cloned = { ...payload }
+  delete cloned.confirm_mixed_channel_risk
+  return cloned
+}
+
+const ensureAntigravityMixedChannelConfirmed = async (onConfirm: () => Promise<void>): Promise<boolean> => {
+  if (!needsMixedChannelCheck(form.platform)) {
+    return true
+  }
+  if (antigravityMixedChannelConfirmed.value) {
+    return true
+  }
+
+  try {
+    const result = await adminAPI.accounts.checkMixedChannelRisk({
+      platform: form.platform,
+      group_ids: form.group_ids
+    })
+    if (!result.has_risk) {
+      return true
+    }
+    openMixedChannelDialog({
+      response: result,
+      onConfirm: async () => {
+        antigravityMixedChannelConfirmed.value = true
+        await onConfirm()
+      }
+    })
+    return false
+  } catch (error: any) {
+    appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToCreate'))
+    return false
+  }
+}
+
+const submitCreateAccount = async (payload: CreateAccountRequest) => {
+  submitting.value = true
+  try {
+    await adminAPI.accounts.create(withAntigravityConfirmFlag(payload))
+    appStore.showSuccess(t('admin.accounts.accountCreated'))
+    emit('created')
+    handleClose()
+  } catch (error: any) {
+    if (error.response?.status === 409 && error.response?.data?.error === 'mixed_channel_warning' && needsMixedChannelCheck(form.platform)) {
+      openMixedChannelDialog({
+        message: error.response?.data?.message,
+        onConfirm: async () => {
+          antigravityMixedChannelConfirmed.value = true
+          await submitCreateAccount(payload)
+        }
+      })
+      return
+    }
+    appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToCreate'))
+  } finally {
+    submitting.value = false
+  }
+}
+
 // Methods
 const resetForm = () => {
   step.value = 1
@@ -2856,9 +2972,13 @@ const resetForm = () => {
   geminiOAuth.resetState()
   antigravityOAuth.resetState()
   oauthFlowRef.value?.reset()
+  antigravityMixedChannelConfirmed.value = false
+  clearMixedChannelDialog()
 }
 
 const handleClose = () => {
+  antigravityMixedChannelConfirmed.value = false
+  clearMixedChannelDialog()
   emit('close')
 }
 
@@ -2917,56 +3037,34 @@ const buildSoraExtra = (
 }
 
 // Helper function to create account with mixed channel warning handling
-const doCreateAccount = async (payload: any) => {
-  submitting.value = true
-  try {
-    await adminAPI.accounts.create(payload)
-    appStore.showSuccess(t('admin.accounts.accountCreated'))
-    emit('created')
-    handleClose()
-  } catch (error: any) {
-    // Handle 409 mixed_channel_warning - show confirmation dialog
-    if (error.response?.status === 409 && error.response?.data?.error === 'mixed_channel_warning') {
-      const details = error.response.data.details || {}
-      mixedChannelWarningDetails.value = {
-        groupName: details.group_name || 'Unknown',
-        currentPlatform: details.current_platform || 'Unknown',
-        otherPlatform: details.other_platform || 'Unknown'
-      }
-      pendingCreatePayload.value = payload
-      showMixedChannelWarning.value = true
-    } else {
-      appStore.showError(error.response?.data?.detail || t('admin.accounts.failedToCreate'))
-    }
-  } finally {
-    submitting.value = false
+const doCreateAccount = async (payload: CreateAccountRequest) => {
+  const canContinue = await ensureAntigravityMixedChannelConfirmed(async () => {
+    await submitCreateAccount(payload)
+  })
+  if (!canContinue) {
+    return
   }
+  await submitCreateAccount(payload)
 }
 
 // Handle mixed channel warning confirmation
 const handleMixedChannelConfirm = async () => {
-  showMixedChannelWarning.value = false
-  if (pendingCreatePayload.value) {
-    pendingCreatePayload.value.confirm_mixed_channel_risk = true
-    submitting.value = true
-    try {
-      await adminAPI.accounts.create(pendingCreatePayload.value)
-      appStore.showSuccess(t('admin.accounts.accountCreated'))
-      emit('created')
-      handleClose()
-    } catch (error: any) {
-      appStore.showError(error.response?.data?.detail || t('admin.accounts.failedToCreate'))
-    } finally {
-      submitting.value = false
-      pendingCreatePayload.value = null
-    }
+  const action = mixedChannelWarningAction.value
+  if (!action) {
+    clearMixedChannelDialog()
+    return
+  }
+  clearMixedChannelDialog()
+  submitting.value = true
+  try {
+    await action()
+  } finally {
+    submitting.value = false
   }
 }
 
 const handleMixedChannelCancel = () => {
-  showMixedChannelWarning.value = false
-  pendingCreatePayload.value = null
-  mixedChannelWarningDetails.value = null
+  clearMixedChannelDialog()
 }
 
 const handleSubmit = async () => {
@@ -2976,6 +3074,12 @@ const handleSubmit = async () => {
       appStore.showError(t('admin.accounts.pleaseEnterAccountName'))
       return
     }
+    const canContinue = await ensureAntigravityMixedChannelConfirmed(async () => {
+      step.value = 2
+    })
+    if (!canContinue) {
+      return
+    }
     step.value = 2
     return
   }
@@ -3132,7 +3236,7 @@ const createAccountAndFinish = async (
   if (!applyTempUnschedConfig(credentials)) {
     return
   }
-  await adminAPI.accounts.create({
+  await doCreateAccount({
     name: form.name,
     notes: form.notes,
     platform,
@@ -3147,9 +3251,6 @@ const createAccountAndFinish = async (
     expires_at: form.expires_at,
     auto_pause_on_expired: autoPauseOnExpired.value
   })
-  appStore.showSuccess(t('admin.accounts.accountCreated'))
-  emit('created')
-  handleClose()
 }
 
 // OpenAI OAuth 授权码兑换
@@ -3497,7 +3598,7 @@ const handleAntigravityValidateRT = async (refreshTokenInput: string) => {
         const accountName = refreshTokens.length > 1 ? `${form.name} #${i + 1}` : form.name
 
         // Note: Antigravity doesn't have buildExtraInfo, so we pass empty extra or rely on credentials
-        await adminAPI.accounts.create({
+        const createPayload = withAntigravityConfirmFlag({
           name: accountName,
           notes: form.notes,
           platform: 'antigravity',
@@ -3512,6 +3613,7 @@ const handleAntigravityValidateRT = async (refreshTokenInput: string) => {
           expires_at: form.expires_at,
           auto_pause_on_expired: autoPauseOnExpired.value
         })
+        await adminAPI.accounts.create(createPayload)
         successCount++
       } catch (error: any) {
         failedCount++

frontend/src/components/account/EditAccountModal.vue

@@ -1139,7 +1139,7 @@
   <ConfirmDialog
     :show="showMixedChannelWarning"
     :title="t('admin.accounts.mixedChannelWarningTitle')"
-    :message="mixedChannelWarningDetails ? t('admin.accounts.mixedChannelWarning', mixedChannelWarningDetails) : ''"
+    :message="mixedChannelWarningMessageText"
     :confirm-text="t('common.confirm')"
     :cancel-text="t('common.cancel')"
     :danger="true"
@@ -1154,7 +1154,7 @@ import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { useAuthStore } from '@/stores/auth'
 import { adminAPI } from '@/api/admin'
-import type { Account, Proxy, AdminGroup } from '@/types'
+import type { Account, Proxy, AdminGroup, CheckMixedChannelResponse } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import ConfirmDialog from '@/components/common/ConfirmDialog.vue'
 import Select from '@/components/common/Select.vue'
@@ -1234,10 +1234,13 @@ const getModelMappingKey = createStableObjectKeyResolver<ModelMapping>('edit-mod
 const getAntigravityModelMappingKey = createStableObjectKeyResolver<ModelMapping>('edit-antigravity-model-mapping')
 const getTempUnschedRuleKey = createStableObjectKeyResolver<TempUnschedRuleForm>('edit-temp-unsched-rule')
 
-// Mixed channel warning dialog state
 const showMixedChannelWarning = ref(false)
-const mixedChannelWarningDetails = ref<{ groupName: string; currentPlatform: string; otherPlatform: string } | null>(null)
-const pendingUpdatePayload = ref<Record<string, unknown> | null>(null)
+const mixedChannelWarningDetails = ref<{ groupName: string; currentPlatform: string; otherPlatform: string } | null>(
+  null
+)
+const mixedChannelWarningRawMessage = ref('')
+const mixedChannelWarningAction = ref<(() => Promise<void>) | null>(null)
+const antigravityMixedChannelConfirmed = ref(false)
 
 // Quota control state (Anthropic OAuth/SetupToken only)
 const windowCostEnabled = ref(false)
@@ -1298,6 +1301,13 @@ const defaultBaseUrl = computed(() => {
   return 'https://api.anthropic.com'
 })
 
+const mixedChannelWarningMessageText = computed(() => {
+  if (mixedChannelWarningDetails.value) {
+    return t('admin.accounts.mixedChannelWarning', mixedChannelWarningDetails.value)
+  }
+  return mixedChannelWarningRawMessage.value
+})
+
 const form = reactive({
   name: '',
   notes: '',
@@ -1327,6 +1337,11 @@ watch(
   () => props.account,
   (newAccount) => {
     if (newAccount) {
+      antigravityMixedChannelConfirmed.value = false
+      showMixedChannelWarning.value = false
+      mixedChannelWarningDetails.value = null
+      mixedChannelWarningRawMessage.value = ''
+      mixedChannelWarningAction.value = null
       form.name = newAccount.name
       form.notes = newAccount.notes || ''
       form.proxy_id = newAccount.proxy_id
@@ -1726,18 +1741,123 @@ function toPositiveNumber(value: unknown) {
   return Math.trunc(num)
 }
 
+const needsMixedChannelCheck = () => props.account?.platform === 'antigravity' || props.account?.platform === 'anthropic'
+
+const buildMixedChannelDetails = (resp?: CheckMixedChannelResponse) => {
+  const details = resp?.details
+  if (!details) {
+    return null
+  }
+  return {
+    groupName: details.group_name || 'Unknown',
+    currentPlatform: details.current_platform || 'Unknown',
+    otherPlatform: details.other_platform || 'Unknown'
+  }
+}
+
+const clearMixedChannelDialog = () => {
+  showMixedChannelWarning.value = false
+  mixedChannelWarningDetails.value = null
+  mixedChannelWarningRawMessage.value = ''
+  mixedChannelWarningAction.value = null
+}
+
+const openMixedChannelDialog = (opts: {
+  response?: CheckMixedChannelResponse
+  message?: string
+  onConfirm: () => Promise<void>
+}) => {
+  mixedChannelWarningDetails.value = buildMixedChannelDetails(opts.response)
+  mixedChannelWarningRawMessage.value =
+    opts.message || opts.response?.message || t('admin.accounts.failedToUpdate')
+  mixedChannelWarningAction.value = opts.onConfirm
+  showMixedChannelWarning.value = true
+}
+
+const withAntigravityConfirmFlag = (payload: Record<string, unknown>) => {
+  if (needsMixedChannelCheck() && antigravityMixedChannelConfirmed.value) {
+    return {
+      ...payload,
+      confirm_mixed_channel_risk: true
+    }
+  }
+  const cloned = { ...payload }
+  delete cloned.confirm_mixed_channel_risk
+  return cloned
+}
+
+const ensureAntigravityMixedChannelConfirmed = async (onConfirm: () => Promise<void>): Promise<boolean> => {
+  if (!needsMixedChannelCheck()) {
+    return true
+  }
+  if (antigravityMixedChannelConfirmed.value) {
+    return true
+  }
+  if (!props.account) {
+    return false
+  }
+
+  try {
+    const result = await adminAPI.accounts.checkMixedChannelRisk({
+      platform: props.account.platform,
+      group_ids: form.group_ids,
+      account_id: props.account.id
+    })
+    if (!result.has_risk) {
+      return true
+    }
+    openMixedChannelDialog({
+      response: result,
+      onConfirm: async () => {
+        antigravityMixedChannelConfirmed.value = true
+        await onConfirm()
+      }
+    })
+    return false
+  } catch (error: any) {
+    appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToUpdate'))
+    return false
+  }
+}
+
 const formatDateTimeLocal = formatDateTimeLocalInput
 const parseDateTimeLocal = parseDateTimeLocalInput
 
 // Methods
 const handleClose = () => {
+  antigravityMixedChannelConfirmed.value = false
+  clearMixedChannelDialog()
   emit('close')
 }
 
+const submitUpdateAccount = async (accountID: number, updatePayload: Record<string, unknown>) => {
+  submitting.value = true
+  try {
+    const updatedAccount = await adminAPI.accounts.update(accountID, withAntigravityConfirmFlag(updatePayload))
+    appStore.showSuccess(t('admin.accounts.accountUpdated'))
+    emit('updated', updatedAccount)
+    handleClose()
+  } catch (error: any) {
+    if (error.response?.status === 409 && error.response?.data?.error === 'mixed_channel_warning' && needsMixedChannelCheck()) {
+      openMixedChannelDialog({
+        message: error.response?.data?.message,
+        onConfirm: async () => {
+          antigravityMixedChannelConfirmed.value = true
+          await submitUpdateAccount(accountID, updatePayload)
+        }
+      })
+      return
+    }
+    appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToUpdate'))
+  } finally {
+    submitting.value = false
+  }
+}
+
 const handleSubmit = async () => {
   if (!props.account) return
+  const accountID = props.account.id
 
-  submitting.value = true
   const updatePayload: Record<string, unknown> = { ...form }
   try {
     // 后端期望 proxy_id: 0 表示清除代理，而不是 null
@@ -1769,7 +1889,6 @@ const handleSubmit = async () => {
         newCredentials.api_key = currentCredentials.api_key
       } else {
         appStore.showError(t('admin.accounts.apiKeyIsRequired'))
-        submitting.value = false
         return
       }
 
@@ -1792,7 +1911,6 @@ const handleSubmit = async () => {
       // Add intercept warmup requests setting
       applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
       if (!applyTempUnschedConfig(newCredentials)) {
-        submitting.value = false
         return
       }
 
@@ -1811,7 +1929,6 @@ const handleSubmit = async () => {
       applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
 
       if (!applyTempUnschedConfig(newCredentials)) {
-        submitting.value = false
         return
       }
 
@@ -1823,7 +1940,6 @@ const handleSubmit = async () => {
 
       applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
       if (!applyTempUnschedConfig(newCredentials)) {
-        submitting.value = false
         return
       }
 
@@ -1953,52 +2069,36 @@ const handleSubmit = async () => {
       updatePayload.extra = newExtra
     }
 
-    const updatedAccount = await adminAPI.accounts.update(props.account.id, updatePayload)
-    appStore.showSuccess(t('admin.accounts.accountUpdated'))
-    emit('updated', updatedAccount)
-    handleClose()
-  } catch (error: any) {
-    // Handle 409 mixed_channel_warning - show confirmation dialog
-    if (error.response?.status === 409 && error.response?.data?.error === 'mixed_channel_warning') {
-      const details = error.response.data.details || {}
-      mixedChannelWarningDetails.value = {
-        groupName: details.group_name || 'Unknown',
-        currentPlatform: details.current_platform || 'Unknown',
-        otherPlatform: details.other_platform || 'Unknown'
-      }
-      pendingUpdatePayload.value = updatePayload
-      showMixedChannelWarning.value = true
-    } else {
-      appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToUpdate'))
+    const canContinue = await ensureAntigravityMixedChannelConfirmed(async () => {
+      await submitUpdateAccount(accountID, updatePayload)
+    })
+    if (!canContinue) {
+      return
     }
-  } finally {
-    submitting.value = false
+
+    await submitUpdateAccount(accountID, updatePayload)
+  } catch (error: any) {
+    appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToUpdate'))
   }
 }
 
 // Handle mixed channel warning confirmation
 const handleMixedChannelConfirm = async () => {
-  showMixedChannelWarning.value = false
-  if (pendingUpdatePayload.value && props.account) {
-    pendingUpdatePayload.value.confirm_mixed_channel_risk = true
-    submitting.value = true
-    try {
-      const updatedAccount = await adminAPI.accounts.update(props.account.id, pendingUpdatePayload.value)
-      appStore.showSuccess(t('admin.accounts.accountUpdated'))
-      emit('updated', updatedAccount)
-      handleClose()
-    } catch (error: any) {
-      appStore.showError(error.response?.data?.message || error.response?.data?.detail || t('admin.accounts.failedToUpdate'))
-    } finally {
-      submitting.value = false
-      pendingUpdatePayload.value = null
-    }
+  const action = mixedChannelWarningAction.value
+  if (!action) {
+    clearMixedChannelDialog()
+    return
+  }
+  clearMixedChannelDialog()
+  submitting.value = true
+  try {
+    await action()
+  } finally {
+    submitting.value = false
   }
 }
 
 const handleMixedChannelCancel = () => {
-  showMixedChannelWarning.value = false
-  pendingUpdatePayload.value = null
-  mixedChannelWarningDetails.value = null
+  clearMixedChannelDialog()
 }
 </script>

frontend/src/types/index.ts

@@ -766,6 +766,26 @@ export interface UpdateAccountRequest {
   confirm_mixed_channel_risk?: boolean
 }
 
+export interface CheckMixedChannelRequest {
+  platform: AccountPlatform
+  group_ids: number[]
+  account_id?: number
+}
+
+export interface MixedChannelWarningDetails {
+  group_id: number
+  group_name: string
+  current_platform: string
+  other_platform: string
+}
+
+export interface CheckMixedChannelResponse {
+  has_risk: boolean
+  error?: string
+  message?: string
+  details?: MixedChannelWarningDetails
+}
+
 export interface CreateProxyRequest {
   name: string
   protocol: ProxyProtocol