GitLab

Add a flexible user attribute system that allows admins to define
custom fields for users (text, textarea, number, email, url, date,
select, multi_select types).

- Add Ent schemas for UserAttributeDefinition and UserAttributeValue
- Add service layer with validation logic
- Add repository layer with batch operations support
- Add admin API endpoints for CRUD and reorder operations
- Add batch API for loading attribute values for multiple users
- Add database migration (018_user_attributes.sql)

🤖 Generated with [Claude Code](https://claude.com/claude-code

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- 新增 TestClaudeMessagesWithClaudeSignature 测试
- 验证历史 thinking block 带有 Claude signature 时的处理
- 修复配额刷新服务的次要问题

- 更新 middleware import 路径到 internal/server/middleware
- 修复 api_key_auth_google.go 使用正确的 service 类型
- 更新 router.go 和 http.go 支持 Gemini v1beta 路由
- 在 routes/gateway.go 中添加 Gemini v1beta API 端点
- 在 routes/admin.go 中添加 Gemini OAuth 路由
- 更新 wire.go 添加 GeminiOAuthService cleanup
- 重新生成 wire_gen.go