feat: bulk update accounts pre-check mixed channel risk with confirm dialog

- Move mixed channel check before any DB writes in BulkUpdateAccounts
- Return 409 from BulkUpdate handler for MixedChannelError
- Add ConfirmDialog to BulkEditAccountModal for mixed channel warning
- Update mixed channel warning message to Chinese

backend/internal/handler/admin/account_handler.go

@@ -1122,6 +1122,14 @@ func (h *AccountHandler) BulkUpdate(c *gin.Context) {
 		SkipMixedChannelCheck: skipCheck,
 	})
 	if err != nil {
+		var mixedErr *service.MixedChannelError
+		if errors.As(err, &mixedErr) {
+			c.JSON(409, gin.H{
+				"error":   "mixed_channel_warning",
+				"message": mixedErr.Error(),
+			})
+			return
+		}
 		response.ErrorFrom(c, err)
 		return
 	}

backend/internal/service/admin_service.go

@@ -1565,6 +1565,19 @@ func (s *adminServiceImpl) BulkUpdateAccounts(ctx context.Context, input *BulkUp
 		groupNameByID = loadedNames
 	}
 
+	// 预检查混合渠道风险：在任何写操作之前，若发现风险立即返回错误。
+	if needMixedChannelCheck {
+		for _, accountID := range input.AccountIDs {
+			platform := platformByID[accountID]
+			if platform == "" {
+				continue
+			}
+			if err := s.checkMixedChannelRisk(ctx, accountID, platform, *input.GroupIDs); err != nil {
+				return nil, err
+			}
+		}
+	}
+
 	if input.RateMultiplier != nil {
 		if *input.RateMultiplier < 0 {
 			return nil, errors.New("rate_multiplier must be >= 0")
@@ -1609,31 +1622,6 @@ func (s *adminServiceImpl) BulkUpdateAccounts(ctx context.Context, input *BulkUp
 		platform := ""
 
 		if input.GroupIDs != nil {
-			// 检查混合渠道风险（除非用户已确认）
-			if !input.SkipMixedChannelCheck {
-				platform = platformByID[accountID]
-				if platform == "" {
-					account, err := s.accountRepo.GetByID(ctx, accountID)
-					if err != nil {
-						entry.Success = false
-						entry.Error = err.Error()
-						result.Failed++
-						result.FailedIDs = append(result.FailedIDs, accountID)
-						result.Results = append(result.Results, entry)
-						continue
-					}
-					platform = account.Platform
-				}
-				if err := s.checkMixedChannelRiskWithPreloaded(accountID, platform, *input.GroupIDs, groupAccountsByID, groupNameByID); err != nil {
-					entry.Success = false
-					entry.Error = err.Error()
-					result.Failed++
-					result.FailedIDs = append(result.FailedIDs, accountID)
-					result.Results = append(result.Results, entry)
-					continue
-				}
-			}
-
 			if err := s.accountRepo.BindGroups(ctx, accountID, *input.GroupIDs); err != nil {
 				entry.Success = false
 				entry.Error = err.Error()
@@ -2541,6 +2529,6 @@ type MixedChannelError struct {
 }
 
 func (e *MixedChannelError) Error() string {
-	return fmt.Sprintf("mixed_channel_warning: Group '%s' contains both %s and %s accounts. Using mixed channels in the same context may cause thinking block signature validation issues, which will fallback to non-thinking mode for historical messages.",
+	return fmt.Sprintf("警告：分组 \"%s\" 中同时包含 %s 和 %s 账号。混合使用不同渠道可能导致 thinking block 签名验证问题，会导致请求报错，请确认混合调用的 Anthropic 账号对应的是反重力反代的 Claude API。确定要继续吗？",
 		e.GroupName, e.CurrentPlatform, e.OtherPlatform)
 }

frontend/src/components/account/BulkEditAccountModal.vue

@@ -756,6 +756,17 @@
       </div>
     </template>
   </BaseDialog>
+
+  <ConfirmDialog
+    :show="showMixedChannelWarning"
+    :title="t('admin.accounts.mixedChannelWarningTitle')"
+    :message="mixedChannelWarningMessage"
+    :confirm-text="t('common.confirm')"
+    :cancel-text="t('common.cancel')"
+    :danger="true"
+    @confirm="handleMixedChannelConfirm"
+    @cancel="handleMixedChannelCancel"
+  />
 </template>
 
 <script setup lang="ts">
@@ -765,6 +776,7 @@ import { useAppStore } from '@/stores/app'
 import { adminAPI } from '@/api/admin'
 import type { Proxy as ProxyConfig, AdminGroup, AccountPlatform, AccountType } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
+import ConfirmDialog from '@/components/common/ConfirmDialog.vue'
 import Select from '@/components/common/Select.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
 import GroupSelector from '@/components/common/GroupSelector.vue'
@@ -844,6 +856,9 @@ const enableRpmLimit = ref(false)
 
 // State - field values
 const submitting = ref(false)
+const showMixedChannelWarning = ref(false)
+const mixedChannelWarningMessage = ref('')
+const pendingUpdatesForConfirm = ref<Record<string, unknown> | null>(null)
 const baseUrl = ref('')
 const modelRestrictionMode = ref<'whitelist' | 'mapping'>('whitelist')
 const allowedModels = ref<string[]>([])
@@ -1238,10 +1253,13 @@ const buildUpdatePayload = (): Record<string, unknown> | null => {
 }
 
 const handleClose = () => {
+  showMixedChannelWarning.value = false
+  mixedChannelWarningMessage.value = ''
+  pendingUpdatesForConfirm.value = null
   emit('close')
 }
 
-const handleSubmit = async () => {
+const handleSubmit = async (confirmMixedChannel = false) => {
   if (props.accountIds.length === 0) {
     appStore.showError(t('admin.accounts.bulkEdit.noSelection'))
     return
@@ -1265,11 +1283,17 @@ const handleSubmit = async () => {
     return
   }
 
-  const updates = buildUpdatePayload()
-  if (!updates) {
+  let updates: Record<string, unknown>
+  if (confirmMixedChannel && pendingUpdatesForConfirm.value) {
+    updates = { ...pendingUpdatesForConfirm.value, confirm_mixed_channel_risk: true }
+  } else {
+    const built = buildUpdatePayload()
+    if (!built) {
       appStore.showError(t('admin.accounts.bulkEdit.noFieldsSelected'))
       return
     }
+    updates = built
+  }
 
   submitting.value = true
 
@@ -1287,17 +1311,34 @@ const handleSubmit = async () => {
     }
 
     if (success > 0) {
+      pendingUpdatesForConfirm.value = null
       emit('updated')
       handleClose()
     }
   } catch (error: any) {
+    if (error.response?.status === 409 && error.response?.data?.error === 'mixed_channel_warning') {
+      pendingUpdatesForConfirm.value = updates
+      mixedChannelWarningMessage.value = error.response.data.message
+      showMixedChannelWarning.value = true
+    } else {
       appStore.showError(error.response?.data?.detail || t('admin.accounts.bulkEdit.failed'))
       console.error('Error bulk updating accounts:', error)
+    }
   } finally {
     submitting.value = false
   }
 }
 
+const handleMixedChannelConfirm = async () => {
+  showMixedChannelWarning.value = false
+  await handleSubmit(true)
+}
+
+const handleMixedChannelCancel = () => {
+  showMixedChannelWarning.value = false
+  pendingUpdatesForConfirm.value = null
+}
+
 // Reset form when modal closes
 watch(
   () => props.show,
@@ -1330,10 +1371,11 @@ watch(
       rateMultiplier.value = 1
       status.value = 'active'
       groupIds.value = []
-      rpmLimitEnabled.value = false
-      bulkBaseRpm.value = null
-      bulkRpmStrategy.value = 'tiered'
-      bulkRpmStickyBuffer.value = null
+
+      // Reset mixed channel warning state
+      showMixedChannelWarning.value = false
+      mixedChannelWarningMessage.value = ''
+      pendingUpdatesForConfirm.value = null
     }
   }
 )