juanatsap 4528e04bad feat: Complete all remaining Future Improvements (#4-8) ...

Implemented 5 additional architectural improvements:

1. Response Types (types.go)
   - APIResponse with Success, Data, Error, Meta fields
   - ErrorInfo with Code, Message, Field, Details
   - MetaInfo with Timestamp, Version, RequestID
   - SuccessResponse() and NewErrorResponse() helpers
   - HealthCheckResponse for health endpoint
   - Consistent JSON API responses

2. Validation Tags (types.go)
   - Added struct tags to LanguageRequest
   - Added struct tags to PDFExportRequest
   - Declarative validation rules (oneof, required)
   - Self-documenting validation constraints
   - Ready for go-playground/validator integration

3. Context Helper Functions (middleware/preferences.go)
   - GetLanguage(), GetCVLength(), GetCVIcons(), GetCVTheme(), GetColorTheme()
   - IsLongCV(), IsShortCV() boolean helpers
   - ShowIcons(), HideIcons() boolean helpers
   - IsCleanTheme(), IsDefaultTheme() boolean helpers
   - IsDarkMode(), IsLightMode() boolean helpers
   - 13 new convenience functions for cleaner code

4. Typed Errors (errors.go)
   - ErrorCode constants for all error types
   - DomainError with Code, Message, Err, StatusCode, Field
   - Unwrap() support for error chains
   - WithError() and WithField() fluent builders
   - InvalidLanguageError(), InvalidLengthError(), etc.
   - PDFGenerationError(), MethodNotAllowedError(), RateLimitError()
   - 13 error codes, domain-specific constructors

5. Benchmark Tests
   - handlers/benchmarks_test.go (11 benchmarks)
   - middleware/benchmarks_test.go (12 benchmarks)
   - Sequential benchmarks for handlers, middleware, request parsing
   - Parallel benchmarks for concurrent load testing
   - Response creation benchmarks
   - Helper function benchmarks

Benefits:
- Type Safety: Validation tags and structured types
- Developer Experience: 13 context helpers reduce boilerplate
- Error Handling: Domain-specific errors with codes
- Performance Monitoring: 23 benchmarks for regression detection
- API Consistency: Standardized response formats
- Maintainability: Self-documenting validation and errors

Testing:
- All unit tests pass
- All benchmarks working
- Build succeeds
- No breaking changes

2025-11-20 18:05:45 +00:00

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