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fix(ops): validate error_type against known whitelist before classification

feat: 添加账号级别 RPM（每分钟请求数）限流功能

为 gosec 添加 -exclude-generated 标志，跳过带有
"// Code generated" 注释的文件（如 wire_gen.go），
防止安全扫描因分析自动生成代码而超时。

feat(admin): 添加管理员直接修改用户 API Key 分组的功能 

feat/admin-apikey-group-update 分支给 UserRepository 接口新增了
AddGroupToAllowedGroups 方法，需要在测试 stub 中补充实现以通过编译。
- sora_client_handler_test.go: stubUserRepoForHandler
- sora_generation_service_test.go: stubUserRepoForQuota

Add missing nil argument for rpmCache to NewAccountHandler (5 sites)
and NewGatewayService (2 sites) after RPM feature expanded their
signatures.

Ensures base_rpm validation (clamp 0-10000) is consistent across
all four account mutation paths: Create, Update, BulkUpdate, BatchCreate.

- Add sanitizeExtraBaseRPM to BulkUpdate handler (was missing)
- Add WindowCost scheduling checks to legacy non-sticky selection
  paths (4 sites), matching existing sticky + load-aware coverage
- Export ParseExtraInt from service package, remove duplicate
  parseExtraIntForValidation from admin handler

- Move IncrementRPM after Forward success to prevent phantom RPM
  consumption during account switch retries
- Add base_rpm input sanitization (clamp to 0-10000) in Create/Update
- Add WindowCost scheduling checks to legacy path sticky sessions
  (4 check sites + 4 prefetch sites), fixing pre-existing gap
- Clean up rpm_strategy/rpm_sticky_buffer when disabling RPM in
  BulkEditModal (JSONB merge cannot delete keys, use empty values)
- Add json.Number test cases to TestGetBaseRPM/TestGetRPMStickyBuffer
- Document TOCTOU race as accepted soft-limit design trade-off

Without this, submitting a bulk edit with only RPM changes would be
rejected as "no fields selected".

Ensures isAccountSchedulableForRPM calls within the routing segment
hit the prefetch cache instead of querying Redis individually.

- Use TxPipeline (MULTI/EXEC) instead of Pipeline for atomic INCR+EXPIRE
- Filter negative values in GetBaseRPM(), update test expectation
- Add RPM batch query (GetRPMBatch) to account List API
- Add warn logs for RPM increment failures in gateway handler
- Reset enableRpmLimit on BulkEditAccountModal close
- Use union type 'tiered' | 'sticky_exempt' for rpmStrategy refs
- Add design decision comments for rdb.Time() RTT trade-off

## 核心功能
- 添加 AdminUpdateAPIKeyGroupID 服务方法，支持绑定/解绑/保持不变三态语义
- 实现 UserRepository.AddGroupToAllowedGroups 接口，自动同步专属分组权限
- 添加 HTTP PUT /api-keys/:id handler 端点，支持管理员直接修改 API Key 分组

## 事务一致性
- 使用 ent Tx 保证专属分组绑定时「添加权限」和「更新 Key」的原子性
- Repository 方法支持 clientFromContext，兼容事务内调用
- 事务失败时自动回滚，避免权限孤立

## 业务逻辑
- 订阅类型分组阻断，需通过订阅管理流程
- 非活跃分组拒绝绑定
- 负 ID 和非法 ID 验证
- 自动授权响应，告知管理员成功授权的分组

## 代码质量
- 16 个单元测试覆盖所有业务路径和边界用例
- 7 个 handler 集成测试覆盖 HTTP 层
- GroupRepo stub 返回克隆副本，防止测试间数据泄漏
- API 类型安全修复（PaginatedResponse<ApiKey>）
- 前端 ref 回调类型对齐 Vue 规范

## 国际化支持
- 中英文提示信息完整
- 自动授权成功/失败提示

- 新增 PUT /api/v1/admin/api-keys/:id 端点，允许管理员修改任意用户 API Key 的分组绑定
- 跳过用户级权限校验但保留分组有效性验证，修改后触发认证缓存失效
- Service 层支持三态语义：nil=不修改，0=解绑，>0=绑定，<0=拒绝
- 指针值拷贝保证安全隔离，负数 groupID 返回 400 INVALID_GROUP_ID
- 前端 UserApiKeysModal 新增可点击的分组选择下拉框，支持多 Key 并发更新
- 下拉支持视口翻转和滚动关闭，按钮有 disabled 和加载状态
- 覆盖：后端 20 个单元测试 (Service 11 + Handler 9) + 前端 16 个 E2E 测试
- golangci-lint 0 issues, make test-unit 全部通过

- Compute normalizedType once and pass to classifyOpsPhase,
  classifyOpsSeverity, classifyOpsIsBusinessLimited, classifyOpsIsRetryable
  instead of raw parsed.ErrorType
- Add test case verifying known type takes precedence over conflicting code

Addresses Copilot review feedback on PR #680.

Upstream proxies (account 4, 112) return `"<nil>"` as the error.type in
their JSON responses — a Go fmt.Sprintf("%v", nil) artifact. Since
`normalizeOpsErrorType` only checked for empty string, the literal
"<nil>" passed through and poisoned the entire classification chain:
error_phase was misclassified as "internal" (instead of "request"),
severity was inflated to P2, and the stored error_type was meaningless.

Add `isKnownOpsErrorType` whitelist so any unrecognised type falls
through to the code-based or default "api_error" classification.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

feat(openai-ws): support websocket mode v2, optimize relay performance, enhance sora

fix(ci): 修复 gosec 扫描因 ent 生成代码导致超时的问题

【问题描述】
backend-security CI job 持续运行约 6 小时后被 GitHub Actions 强制取消，
表现为 'Run gosec' 步骤挂起，最终以 cancelled 状态结束。

【根本原因】
gosec 对 ./... 执行 AST 静态分析时，包含了 ent/ 目录下的
自动生成文件（如 mutation.go 共 24800 行），导致分析时间
超出 GitHub Actions 默认的 6 小时上限。

【修复方案】
1. gosec 命令增加 -exclude-dir=ent 跳过自动生成代码目录
2. backend-security job 增加 timeout-minutes: 15，避免未来
   类似问题再次长时间卡死后才被发现

ent/ 目录内容全部由 Ent ORM 框架自动生成，开发者不直接编写，
不需要纳入人工安全审计范围，排除后不影响扫描有效性。

feat(i18n): 切换语言时同步更新页面标题

fix: add 2K image default pricing at 1.5x base price

fix(frontend): add priority hint in edit account modal

Previously 2K images used the same base price as 1K ($0.134).
Now 2K uses 1.5x multiplier ($0.201), consistent with 4K using 2x ($0.268).

- Backend: add 2K size branch in getDefaultImagePrice
- Frontend: update 2K placeholder from 0.134 to 0.201
- Tests: update assertions for new 2K default price