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新增 jsonMarshalRaw 使用 SetEscapeHTML(false) 替代 json.Marshal，
避免 HTML 字符转义导致客户端无法直接使用返回的 URL。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

使用 go-sora2api v1.1.0 SDK 替代原有 ~2000 行自建 HTTP/PoW/TLS 指纹代码，
SDK 提供高并发性能优化（实例级 rand、PoW 缓冲区复用、context.Context 支持）。

- 新增 SoraSDKClient 适配器实现 SoraClient 接口
- 精简 sora_client.go 为仅保留接口和类型定义
- 更新 Wire 绑定使用 SoraSDKClient
- 删除 SoraDirectClient、sora_curl_cffi_sidecar、sora_request_guard 等旧代码
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

feat: 补充 Antigravity 的 Gemini 3.1 Pro 透传快捷按钮

fix: 默认补全 Antigravity 的 Gemini 3.1 Pro 透传映射

docs: 增加跨平台批量修改导致模型映射丢失的排障经验

feat: 反重力（Antigravity）增强、Failover 重构及新模型支持

fix: 补全 Antigravity 模型映射升级与快捷按钮

fix: 刷新用量成功后自动清理账号可恢复错误状态

fix: 修复 Gemini 授权链接生成失败（issue #613）

- Change layout from fixed 3-column grid to vertical-first responsive
  columns (1 col for ≤4 items, 2 cols for ≤8, 3 cols for 9+)
- Add short aliases for all known model scope keys (e.g. COpus46, CSon46,
  G3PH, G3F) to reduce badge width
- Display countdown timer directly on each badge (supports h/m/s)
- Retain legacy scope aliases for backward compatibility

- Remove Gemini platform exclusion from model restriction UI in
  Create/Edit account modals (Gemini now supports model_mapping)
- Remove outdated Gemini model passthrough info cards
- Add model_mapping field to GeminiCredentials type
- Extend warmup request interception toggle to Antigravity platform
- Remove redundant try/catch in API key account creation
- Remove noisy gateway.request_completed debug log
- Reorganize Gemini model mapping sections in constants.go

The ClientSecret constant was left as an empty string after
getClientSecret() was refactored to use defaultClientSecret.
Remove the dead constant and update the test accordingly.

- Fix oauth_test.go and client_test.go to use defaultClientSecret
  variable instead of env var (init() already sets the default)
- Align migration 058 gemini-3-pro-high/low/preview mappings with
  constants.go (map to 3.1 versions)

Add a built-in default for ANTIGRAVITY_OAUTH_CLIENT_SECRET so the
service works out of the box without requiring environment variable
configuration. The env var can still override the default.

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 Gemini model presets to BulkEditAccountModal for bulk model mapping.
Fix AccountStatusIndicator model rate limit grid layout using proper
grid container.

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