* feat: add user profile update feature with moderation support
Add ability for users to update their display name with optional machine/human review.
Backend:
- Add profile_change_request table (V15 migration)
- Add UserProfileService with moderation workflow
- Add PATCH /api/v1/user/profile and GET /api/v1/user/profile endpoints
- Add ProfileModerationService interface with NoOp implementation
- Add ProfileModerationProperties for machine/human review toggles
- Update AuthController /me to refresh session when displayName changes
- Add i18n messages for profile validation and responses
Frontend:
- Add /settings/profile page with edit-on-click pattern
- Add profileApi.updateProfile() to client
- Update user menu: add "Profile Settings", make "Security Settings" local-only
- Add i18n translations (en/zh) for profile settings
Testing:
- Add UserProfileControllerTest with 8 test cases
- Add UserProfileServiceTest with 6 test cases
- Add AuthControllerTest case for session refresh on displayName change
* version sql
* merge main
- Add ApiError class with status code for structured error handling
- Add global QueryCache/MutationCache error handlers with auto-toast
- Auto-redirect to login on 401, show appropriate messages for 403/404/5xx
- Add i18n to review-detail.tsx, token-list.tsx, confirm-dialog.tsx
- Add review, token, apiError translation keys to zh.json and en.json
