Implement application setup and flow middleware

- Add SetupService for detecting application setup completion
- Create ApplicationFlowMiddleware to enforce setup  auth  main flow
- Add setup processing endpoints (/api/auth/setup, /api/auth/setup/status)
- Add Pydantic models for setup requests and responses
- Integrate middleware into FastAPI application
- Fix logging paths to use ./logs consistently
- All existing templates (setup.html, login.html) already working

src/core/SeriesApp.py

@@ -1,6 +1,6 @@
-from src.core.SerieScanner import SerieScanner
 from src.core.entities.SerieList import SerieList
 from src.core.providers.provider_factory import Loaders
+from src.core.SerieScanner import SerieScanner
 
 
 class SeriesApp: