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feat(proxy): 集中代理 URL 验证并实现全局 fail-fast

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

feat(settings): add default subscriptions for new users

feat(identity): 指纹缓存 TTL 懒续期机制

fix(dashboard): sort recent usage tooltip labels by token consumption

- add default subscriptions to admin settings

- auto-assign subscriptions on register and admin user creation

- add validation/tests and align settings UI with subscription selector patterns

- TTL 改为 7 天，配合 24 小时自动续期保持活跃账号永不过期
- 版本升级时采用合并语义，仅更新请求中实际存在的字段
- 添加产品名验证防止浏览器 UA 误判为更新版本

feat(admin): 代理密码可见性 + 复制代理 URL 功能

- 新增 AdminProxy / AdminProxyWithAccountCount DTO，遵循项目 Admin DTO 分层模式
- Proxy.Password 恢复 json:"-" 隐藏，ProxyFromService 不再赋值密码（纵深防御）
- 管理员接口使用 ProxyFromServiceAdmin / ProxyWithAccountCountFromServiceAdmin
- 前端代理列表新增 Auth 列：显示用户名 + 掩码密码 + 眼睛图标切换可见性
- Address 列新增复制按钮：左键复制完整 URL，右键选择格式
- 编辑模态框密码预填充 + 脏标记，避免误更新

feat(dashboard): add group usage distribution chart to usage page

Add a doughnut chart showing usage statistics broken down by group on
the admin usage records page. The chart appears alongside the existing
model distribution chart (2-column grid), with the token usage trend
chart moved to a separate full-width row below.

Changes:
- backend/pkg/usagestats: add GroupStat type
- backend/service: add GetGroupStatsWithFilters interface method and implementation
- backend/repository: implement GetGroupStatsWithFilters with LEFT JOIN groups
- backend/handler: add GetGroupStats handler with full filter support
- backend/routes: register GET /admin/dashboard/groups route
- backend/tests: add GetGroupStatsWithFilters stubs to contract/sora tests
- frontend/types: add GroupStat interface
- frontend/api: add getGroupStats API function and types
- frontend/components: add GroupDistributionChart.vue doughnut chart
- frontend/views: update UsageView layout and load group stats in parallel
- frontend/i18n: add groupDistribution, group, noGroup keys (zh + en)

fix(group): clear nullable limit fields on update

Upgrade GitHub Actions to latest versions

feat: add mixed-channel warning for bulk account edit

feat(admin): add create-and-redeem endpoint for payment integrations

Upgrade GitHub Actions for Node 24 compatibility

- Move ADMIN_PAYMENT_INTEGRATION_API.md → docs/ADMIN_PAYMENT_INTEGRATION_API.md
- Update README.md reference path
- Add payment integration doc download link in admin settings UI (Purchase section)
- Add i18n keys: integrationDoc / integrationDocHint (zh + en)

feat(gateway): 添加 Claude Code 客户端最低版本检查功能

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

- 修复 errcheck: singleflight 返回值类型断言添加 ok 检查
- 修复 gofmt: 格式化 setting_service.go 和 claude_code_validator_test.go
- 修复 TestAPIContracts: 在 GET /admin/settings 期望中添加 min_claude_code_version 字段

- 通过 User-Agent 识别 Claude Code 客户端并提取版本号
- 在网关层验证客户端版本是否满足管理员配置的最低要求
- 在管理后台提供版本要求配置选项（英文/中文双语）
- 实现原子缓存 + singleflight 防止并发问题和 thundering herd
- 使用 context.WithoutCancel 隔离 DB 查询，避免客户端断连影响缓存
- 双 TTL 策略：60s 正常、5s 错误恢复，保证性能与可用性
- 仅检查 Claude Code 客户端，其他客户端不受影响
- 添加完整单元测试覆盖版本提取、比对、上下文操作

- BulkUpdate handler: add structured details to 409 response
- BulkUpdateAccounts: simplify to global pre-check before any DB write;
  remove per-account snapshot tracking which is no longer needed
- MixedChannelError.Error(): restore English message for API compatibility
- BulkEditAccountModal: use t() with details for both pre-check and 409
  fallback paths instead of displaying raw backend strings
- Update test to verify pre-check blocks on existing group conflicts

Previously, preCheckMixedChannelRisk() skipped when selectedPlatforms
had more than one entry, and the catch block in submitBulkUpdate had no
409 handling — so multi-platform conflicts just showed a generic error.

- Rename canPreCheck(): only call pre-check API for single-platform
  antigravity/anthropic selections (API requires a single platform param)
- Pass `built` into preCheckMixedChannelRisk() so pendingUpdatesForConfirm
  is set before returning false
- submitBulkUpdate: add 409 mixed_channel_warning catch as fallback for
  multi-platform case, saving baseUpdates for retry
- Remove needsMixedChannelCheck() gate on confirm_mixed_channel_risk flag;
  use mixedChannelConfirmed alone so multi-platform retry also works

The response interceptor in client.ts transforms errors into plain
objects {status, code, message}, but catch blocks were checking
error.response?.status (AxiosError format) which never matched.

- Add error field passthrough in client.ts interceptor
- Refactor BulkEditAccountModal to use pre-check API (checkMixedChannelRisk)
  before submit, matching the single edit flow
- Fix EditAccountModal catch blocks to use interceptor error format
- Add bulk-update mixed channel unit tests

- 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

- 移除 README.md / README_CN.md 中的 Codex CLI WebSocket v2 配置示例
- UseKeyModal OpenAI 分组新增 "Codex CLI (WebSocket)" tab，区分普通模式与 WS 模式
- 普通模式 config.toml 不含 WebSocket 字段，WS 模式包含 supports_websockets 和 features 配置
- 所有配置统一使用 sub2api 作为 model_provider 名称

standalone gosec 扫描 24 万行 Go 代码在 CI 中持续超时，
将其作为 golangci-lint 的内置 linter 运行，复用 AST 解析和缓存大幅提速。

- 在 .golangci.yml 中启用 gosec 并迁移原有排除规则
- golangci-lint timeout 从 5m 提升到 30m
- 从 security-scan.yml 移除 standalone gosec 步骤
- 删除不再需要的 .gosec.json 配置文件

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