Frontend fixes:
- Stop retrying 429 rate limit errors to prevent infinite loops
- Show user-friendly error message for rate limit with retry-after duration
- Remove 429 from retryable status codes
- Clean up rate limit error handling logic
Backend fixes:
- Fix Swagger /docs route to use same handler as /swagger/*any
- Remove redirect that was causing 404 errors
- Created comprehensive Zod schemas (apiRequestSchemas.ts) for:
* LoginRequest, RegisterRequest, CreateUserRequest
* UpdateUserRequest, UpdateProfileRequest
* SendMessageRequest, UpdateMessageRequest
* CreateConversationRequest, UpdateConversationRequest
* UploadTrackRequest, UpdateTrackRequest
* PaginationParams and list/search request types
- Added validation utilities:
* validateApiRequest: Validate requests before sending
* safeValidateApiRequest: Safe validation with error handling
* validateApiRequestWithError: Validation with custom error handler
- Integrated validation into API client request interceptor
- Enhanced validatedApiClient with request validation support
- Automatic validation prevents invalid requests from being sent
- Comprehensive test suite (19 tests, all passing)
- Ensures runtime type safety for all API requests
- Created comprehensive Zod schemas (apiSchemas.ts) for:
* User, Track, Playlist, Conversation, Message
* Session, AuditLog, Notification
* PaginationData, ApiError, ApiResponse
- Added validation utilities:
* validateApiResponse: Validate and normalize responses
* safeValidateApiResponse: Safe validation with error handling
* validateApiResponseArray: Validate arrays of items
* validatePaginatedResponse: Validate paginated responses
- Integrated validation into API client interceptor
- Created validatedApiClient for type-safe API calls
- Automatic ID normalization during validation
- Comprehensive test suite (13 tests, all passing)
- Ensures runtime type safety for all API responses
- Unified token storage to use TokenStorage service
- Removed deprecated token-manager.ts
- Removed fallback storage logic in API client
- Updated tests and feature components to use TokenStorage
Resolves: INT-000002
Severity: P0
