- Split monolithic 600+ line controller into 5 focused service classes
- AuthorizationService: centralized auth/permission handling
- FileSystemService: path management and file operations
- MediaAnalysisService: image/video metadata extraction
- ProjectService: business logic for project operations
- AdsOverviewService: complex recursive tree generation
- Apply Single Responsibility Principle for better maintainability
- Preserve all existing functionality and API compatibility
- Remove temporary backup and development files
- Improve code organization and reusability
