- 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
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