GitLab

- gofmt: 修复 admin_service/antigravity_oauth_service/token_refresh_service 格式
- staticcheck S1009: 移除 SetUserSettingsResponse.IsSuccess 中冗余的 nil 检查
- unused: 将仅测试使用的 applyAntigravitySubscriptionResult 移至测试文件

Made-with: Cursor

复用已有 GetTier() 返回的 tier ID（free-tier / g1-pro-tier /
g1-ultra-tier），通过 TierIDToPlanType 映射为 Free / Pro / Ultra，
在 loadProjectIDWithRetry 中顺带提取并写入 credentials.plan_type；
前端增加 Abnormal 异常套餐红色标记。

Made-with: Cursor

新增 Antigravity OAuth 隐私设置能力，在账号创建、刷新、导入和后台
Token 刷新路径自动调用 setUserSettings + fetchUserInfo 关闭遥测；
持久化后同步内存 Extra，错误处理改为日志记录。

Made-with: Cursor

## Problem

When a proxy is unreachable, token refresh retries up to 4 times with
30s timeout each, causing requests to hang for ~2 minutes before
failing with a generic 502 error. The failed account is not marked,
so subsequent requests keep hitting it.

## Changes

### Proxy connection fast-fail
- Set TCP dial timeout to 5s and TLS handshake timeout to 5s on
  antigravity client, so proxy connectivity issues fail within 5s
  instead of 30s
- Reduce overall HTTP client timeout from 30s to 10s
- Export `IsConnectionError` for service-layer use
- Detect proxy connection errors in `RefreshToken` and return
  immediately with "proxy unavailable" error (no retries)

### Token refresh temp-unschedulable
- Add 8s context timeout for token refresh on request path
- Mark account as temp-unschedulable for 10min when refresh fails
  (both background `TokenRefreshService` and request-path
  `GetAccessToken`)
- Sync temp-unschedulable state to Redis cache for immediate
  scheduler effect
- Inject `TempUnschedCache` into `AntigravityTokenProvider`

### Account failover
- Return `UpstreamFailoverError` on `GetAccessToken` failure in
  `Forward`/`ForwardGemini` to trigger handler-level account switch
  instead of returning 502 directly

### Proxy probe alignment
- Apply same 5s dial/TLS timeout to shared `httpclient` pool
- Reduce proxy probe timeout from 30s to 10s

- Fix gofmt alignment in admin_service.go and trailing newline in
  antigravity_credits_overages.go
- Suppress errcheck for fmt.Sscanf in client.go GetMinimumAmount

Backend:
- Detect and classify 403 responses into three types:
  validation (account needs Google verification),
  violation (terms of service / banned),
  forbidden (generic 403)
- Extract verification/appeal URLs from 403 response body
  (structured JSON parsing with regex fallback)
- Add needs_verify, is_banned, needs_reauth, error_code fields
  to UsageInfo (omitempty for zero impact on other platforms)
- Handle 403 in request path: classify and permanently set account error
- Save validation_url in error_message for degraded path recovery
- Enrich usage with account error on both success and degraded paths
- Add singleflight dedup for usage requests with independent context
- Differentiate cache TTL: success/403 → 3min, errors → 1min
- Return degraded UsageInfo instead of HTTP 500 on quota fetch errors

Frontend:
- Display forbidden status badges with color coding (red for banned,
  amber for needs verification, gray for generic)
- Show clickable verification/appeal URL links
- Display needs_reauth and degraded error states in usage cell
- Add Antigravity tier label badge next to platform type

Tests:
- Comprehensive unit tests for classifyForbiddenType (7 cases)
- Unit tests for extractValidationURL (8 cases including unicode escapes)
- Integration test for FetchQuota forbidden path

The SSE stream termination marker string was incorrectly included in
DefaultStopSequences, causing Gemini to prematurely stop generating
output whenever the model produced text containing that marker.

The SSE-level protocol filtering in stream_transformer.go already
handles this marker correctly; it should not be a stop sequence for
the model's text generation.

PR #682 (release → main 全量同步) 将 Antigravity 和 Gemini CLI 的
OAuth client_secret 硬编码值替换为了 "GOCSPX-your-client-secret" 占位符，
导致未配置环境变量的部署环境中 token 刷新失败。

恢复内容：
- antigravity/oauth.go: 恢复真实 client_secret
- antigravity/oauth_test.go: 恢复测试断言中的真实值
- geminicli/constants.go: 恢复真实 client_secret

提取 proxyurl.Parse() 公共包，将分散在 6 处的代理 URL 验证逻辑
统一收敛，确保无效代理配置在创建时立即失败，永不静默回退直连。

主要变更：
- 新增 proxyurl 包：统一 TrimSpace → url.Parse → Host 校验 → Scheme 白名单
- socks5:// 自动升级为 socks5h://，防止 DNS 泄漏（大小写不敏感）
- antigravity: http.ProxyURL → proxyutil.ConfigureTransportProxy 支持 SOCKS5
- openai_oauth: 删除 newOpenAIOAuthHTTPClient，收编至 httpclient.GetClient
- 移除未使用的 ProxyStrict 字段（fail-fast 已是全局默认行为）
- 补充 15 个 proxyurl 测试 + pricing/usage fail-fast 测试

Update the default user-agent version from 1.18.4 to 1.19.6
to match the latest official antigravity client.

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.

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.

- 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

Gemini 2.5 Pro/Flash thinking models return thoughtsTokenCount separately
from candidatesTokenCount in usageMetadata, but this field was not parsed
or included in billing calculations, causing thinking tokens to be
unbilled.

- Add ThoughtsTokenCount field to GeminiUsageMetadata struct
- Include thoughtsTokenCount in OutputTokens across all 3 Gemini usage
  parsing paths (non-streaming, streaming, compat layer)
- Add tests covering thinking token scenarios

Closes #554

- 新增 OnboardUser API 客户端方法，支持账号 onboarding 获取 project_id
- loadProjectIDWithRetry 增加 onboard 回退：LoadCodeAssist 未返回 project_id 时自动触发 onboarding
- GetAccessToken 中 project_id 补齐改用轻量 FillProjectID 替代全量 RefreshAccountToken
- 补齐逻辑增加 5 分钟冷却机制，防止频繁重试
- OnboardUser 轮询等待改为 context 感知，支持提前取消
- 提取 mergeCredentials 辅助方法消除重复代码
- 新增 extractProjectIDFromOnboardResponse 和 resolveDefaultTierID 单元测试

🧠 refactor(antigravity): 完善 thinking 预算分配策略并重构工具构建逻辑

✨ feat(antigravity): 支持 thinking adaptive 类型并适配 Opus 4.6 动态预算
🧪 test(gateway): 增加 thinking 模式解析与签名块过滤的边界用例测试

安全修复（P0）：
- 移除硬编码的 OAuth client_secret（Antigravity、Gemini CLI），
  改为通过环境变量注入（ANTIGRAVITY_OAUTH_CLIENT_SECRET、
  GEMINI_CLI_OAUTH_CLIENT_SECRET）
- 新增 logredact.RedactText() 对非结构化文本做敏感信息脱敏，
  覆盖 GOCSPX-*/AIza* 令牌和常见 key=value 模式
- 日志中不再打印 org_uuid、account_uuid、email_address 等敏感值

安全修复（P1）：
- URL 验证增强：新增 ValidateHTTPURL 统一入口，支持 allowlist 和
  私网地址阻断（localhost/内网 IP）
- 代理回退安全：代理初始化失败时默认阻止直连回退，防止 IP 泄露，
  可通过 security.proxy_fallback.allow_direct_on_error 显式开启
- Gemini OAuth 配置校验：client_id 与 client_secret 必须同时
  设置或同时留空

其他改进：
- 新增 tools/secret_scan.py 密钥扫描工具和 Makefile secret-scan 目标
- 更新所有 docker-compose 和部署配置，传递 OAuth secret 环境变量
- google_one OAuth 类型使用固定 redirectURI，与 code_assist 对齐
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

删除因GitHub计费锁定而失败的CI工作流。
为6个核心Go源文件补充单元测试，全部达到50%以上覆盖率：
- response/response.go: 97.6%
- antigravity/oauth.go: 90.1%
- antigravity/client.go: 88.6% (新增27个HTTP客户端测试)
- geminicli/oauth.go: 91.8%
- service/oauth_service.go: 61.2%
- service/gemini_oauth_service.go: 51.9%

新增/增强8个测试文件，共计5600+行测试代码。
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

新增测试文件:
- cors_test.go: CORS 条件化头部测试（12个测试，覆盖白名单/黑名单/通配符/凭证/多源/Vary）
- gateway_helper_backoff_test.go: nextBackoff 退避测试（6个测试+基准，验证指数增长/边界/抖动/收敛）
- billing_cache_jitter_test.go: jitteredTTL 抖动测试（5个测试+基准，验证范围/上界/方差/均值）
- subscription_calculate_progress_test.go: calculateProgress 纯函数测试（9个测试，覆盖日/周/月限额/超限截断/过期）
- openai_gateway_handler_test.go: SSE JSON 转义测试（7个子用例，验证双引号/反斜杠/换行符安全）

更新测试文件:
- response_transformer_test.go: 增强 generateRandomID 测试（7个测试，含并发/字符集/降级计数器）
- security_headers_test.go: 适配 GenerateNonce 新签名
- api_key_auth_test.go: 适配 NewSubscriptionService 新参数
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

P0: OpenAI SSE 错误消息 JSON 注入 — 使用 json.Marshal 替代 fmt.Sprintf
P1: subscription 续期包裹 Ent 事务确保原子性
P1: CSP nonce 生成处理 crypto/rand 错误，失败降级为 unsafe-inline
P1: singleflight 透传数据库真实错误，不再吞没为 not found
P1: GetUserSubscriptionsWithProgress 提取 calculateProgress 消除 N+1
P2: billing_cache/gateway_helper 迁移到 math/rand/v2 消除全局锁争用
P2: generateRandomID 降级分支增加原子计数器防碰撞
P2: CORS 非白名单 origin 不再设置 Allow-Headers/Methods/Max-Age
P2: Turnstile 验证移除 VerifyCode 空值跳过条件防绕过
P2: Redis Cluster Lua 脚本空 KEYS 添加兼容性警告注释
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>