- Created comprehensive test suite for response format
- Test Success() returns wrapped format {success: true, data: {...}}
- Test Created() returns wrapped format
- Test Error() returns wrapped format for all status codes
- Test RespondWithAppError() returns wrapped format
- Test ValidationError() returns wrapped format with details
- Test all helper functions use wrapped format consistently
- All 7 test functions pass successfully (13+ test cases)
- Tests verify all response helpers return wrapped format
- Action 1.3.2.5 complete - backend response format verified
