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feat: implement automated data retention and cleanup system

- Add CleanupService to manage build retention based on configurable age thresholds
- Introduce system_settings and cleanup_runs tables for persistence
- Add CleanupRunRepository and SystemSettingsRepository interfaces and implementations
- Extend BuildRepository with ListExpiredBuilds method for querying old builds
- Wire cleanup worker into App lifecycle with configurable interval
- Add retention settings API endpoints (GET/PUT /api/settings/retention,