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Add missing gemini-3.1-pro-preview -> gemini-3.1-pro-high mapping to
DefaultAntigravityModelMapping for consistency with migration 059.

Add migration 058 to update existing Antigravity accounts with
claude-sonnet-4-6 in model_mapping. Add migration 059 to add
gemini-3.1-pro-high/low/preview mappings.

Update the default ANTIGRAVITY_USER_AGENT_VERSION from 1.84.2 to
1.18.4 to match the current Antigravity-Manager desktop client.

Add claude-sonnet-4-6 to identity injection modelInfoMap and
Antigravity model selector. Add gemini-3.1-pro-high/low to
Antigravity model list and Sonnet 4.6 preset mapping.

- Add claude-sonnet-4-6 to default Antigravity model mapping
- Add antigravity_extra_retries default value in config
- Add cache-dependency-path to CI setup-go for faster builds
- Simplify vitest config to avoid vite plugin compatibility issues

Add comprehensive tests for warmup request interception behavior
covering Antigravity accounts with various credential configurations.

Remove the special case that bypassed model-supported checks for Gemini
API Key accounts, allowing model_mapping to filter requests properly.
Add tests for multiplatform model filtering behavior.

- Use mapped model (billingModel) instead of original request model for billing
- Use resolveFinalAntigravityModelKey for 429 rate limit model key,
  ensuring rate limit records match the actual upstream model
- Add regression tests for both fixes

- Extract duplicated failover logic from gateway_handler.go (3 places)
  and gemini_v1beta_handler.go into shared failover_loop.go
- Introduce FailoverState with HandleFailoverError and HandleSelectionExhausted
- Move helper functions (needForceCacheBilling, sleepWithContext) into failover_loop.go
- Add comprehensive unit tests (32+ test cases)
- Delete redundant gateway_handler_single_account_retry_test.go

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

Extract applyInterceptWarmup utility to unify all credential building
call sites:
- Fix upstream account creation missing intercept_warmup_requests write
- Fix apikey edit mode missing else-branch to clear the setting
- Add backend unit test for IsInterceptWarmupEnabled
- Add frontend unit test for credentialsBuilder

Before this change, when a client disconnected mid-request, the error
message was "Upstream request failed after retries", which is misleading
and pollutes error logs. Now we check context.Err() to return a more
accurate "Client disconnected" message for both Claude and Gemini
forward paths.

skipIfExternalServiceUnavailable 检查了 "timeout" 但 Go 的
context.DeadlineExceeded 错误信息是 "context deadline exceeded"，
不包含 "timeout" 子串，导致外部服务不可达时测试直接失败而非跳过。

- oauth.go: GetUserAgent() 缺少闭合大括号导致语法错误
- client_test.go/oauth_test.go: UserAgent 变量已重构为 GetUserAgent()，更新测试引用
- model_rate_limit_test.go: gemini-3-pro-preview 映射目标已更新为 gemini-3.1-pro-high，同步测试

idempotency_key_hash 和 request_fingerprint 列为 VARCHAR(64)，
而 uniqueTestValue 生成的字符串含完整测试名可能超过 64 字符。
新增 hashedTestValue 辅助函数对测试值做 SHA-256 哈希，
与生产逻辑一致且严格符合列宽限制。

idempotency_repo_integration_test.go 中的 ptrTime 与
scheduler_cache.go 中的声明冲突，导致 repository 包测试构建失败。

- logger: sinkCore 包装 tee core 时绕过了子 core 的 Check 级别过滤，
  导致每条日志同时写入 stdout 和 stderr，表现为启动日志重复显示。
  修复为正确委托 Check 给内部 tee core，sinkCore.Write 仅负责 sink 转发。
- migration 054: 移除冗余的遗留列回填逻辑，migration 009 已完成数据迁移，
  直接删除遗留列即可。

- 将媒体写入和删除切换为 os.Root 沙箱 API
- 移除旧的路径拼接校验辅助函数并收敛删除逻辑
- 调整并新增相关单元测试覆盖删除行为
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 新增安全路径拼接校验，确保目标文件仍在下载目录内
- 清理失败下载文件时复用安全校验，避免不安全删除路径
- 增加扩展名白名单归一化与相关单元测试
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 后端新增绝对重置时间字段计算（codex_5h_reset_at/codex_7d_reset_at）

- 前端统一窗口解析逻辑：绝对时间优先，updated_at+seconds 回退，过期自动归零

- 新增后端与前端单元测试，覆盖关键边界与异常场景

- 将 jwt.access_token_expire_minutes 默认值改为 0，未显式配置时回退 expire_hour

- 调整配置校验为允许 0，仅拒绝负数并补充优先级注释

- 新增配置与认证服务单元测试，覆盖分钟优先与小时回退场景

- 更新示例配置文档，明确分钟/小时优先级与默认行为

- ClearRateLimit 增加清理 temp_unschedulable 与缓存\n- 新增 ClearRateLimit 相关单元测试覆盖成功与失败分支

- 新增 UsageRecordWorkerPool，支持有界队列、溢出降级策略与自动扩缩容
- 将 Gateway/OpenAI/Sora/Gemini 使用量记录改为提交到统一任务池执行
- 增加 usage_record 配置默认值与校验规则，并补充配置与任务提交相关测试
- 注入并托管 worker 池生命周期，服务退出时统一 StopAndWait
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 在 CreateAccountModal 为 Anthropic API Key 增加自动透传开关

- 创建请求写入 extra.anthropic_passthrough 并补充状态重置

- 新增 AccountHandler 单测，验证 extra 字段从请求到 CreateAccountInput 的透传

- 新增 Anthropic API Key 自动透传开关与后端透传分支（仅替换认证）

- 账号编辑页新增自动透传开关，默认关闭

- 优化透传性能：SSE usage 解析 gjson 快路径、减少请求体重复拷贝、优化流式写回与非流式 usage 解析

- 补充单元测试与 benchmark，确保 Claude OAuth 路径不受影响

将 /v1/chat/completions 的拦截文案改为旧协议不支持，避免误导为会路由到 Sora。
明确要求客户端改用 /v1/responses。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- 为 codex_cli_only 增加 originator 判定通道，避免仅依赖 User-Agent 误拦截
- 扩展官方客户端家族标识，补充 codex_chatgpt_desktop 等常见前缀
- 新增并更新单元测试与网关透传回归测试，覆盖 UA 与 originator 组合场景
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add the newly released Gemini 3.1 Pro model to both the
native API fallback list and the admin UI test model dropdown.