Implement Comprehensive Testing and Quality Assurance

## Overview
Implement comprehensive testing framework and quality assurance processes for the raga detection system.

## Testing Strategy
- [ ] **Unit Tests**: Test individual components and functions
- [ ] **Integration Tests**: Test component interactions
- [ ] **End-to-End Tests**: Test complete user workflows
- [ ] **Performance Tests**: Test system performance under load
- [ ] **Cultural Validation**: Test with expert musicians and musicologists

## Test Categories
### Audio Processing Tests
- [ ] Pitch tracking accuracy tests
- [ ] Shruti detection validation
- [ ] Gamaka detection tests
- [ ] Taal cycle detection tests
- [ ] Performance structure analysis tests

### Model Tests
- [ ] CNN classifier accuracy tests
- [ ] Advanced system integration tests
- [ ] Cultural knowledge base validation
- [ ] Ensemble system tests
- [ ] Confidence scoring validation

### API and Interface Tests
- [ ] Audio upload and processing tests
- [ ] Real-time analysis tests
- [ ] Error handling tests
- [ ] User interface functionality tests
- [ ] Cross-browser compatibility tests

## Quality Assurance
- [ ] Code review process
- [ ] Automated testing pipeline
- [ ] Performance monitoring
- [ ] Error logging and tracking
- [ ] User feedback collection

## Success Criteria
- [ ] >90% test coverage for core components
- [ ] All tests pass in CI/CD pipeline
- [ ] Performance benchmarks met
- [ ] Expert validation completed
- [ ] User acceptance testing passed

## Files to Create
- `tests/test_audio_processing.py`
- `tests/test_models.py`
- `tests/test_api.py`
- `tests/test_cultural_validation.py`
- `.github/workflows/test.yml`

## Priority: Medium
Essential for production readiness and reliability.