feat(system-reset): add system reset and factory reset feature

- Add FACTORY_RESET_ON_STARTUP and ENABLE_FACTORY_RESET config settings
- Create app/utils/system_reset.py with core reset logic (wipe DB + files, reimport)
- Create app/api/system_reset.py with admin-only API endpoints
- Create app/views/system_reset.py with admin-only UI view
- Create frontend/templates/system_reset.html with confirmation dialogs
- Auto-reset on startup when FACTORY_RESET_ON_STARTUP=true
- Re-import uses watch folder mechanism for re-ingestion
- Register routers in API and views init files
- Add i18n keys and SETTING_METADATA entries
- Add nav links in base.html (desktop + mobile)

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/main.py

@@ -170,6 +170,12 @@ async def lifespan(app: FastAPI):
     # Startup: Initialize database
     init_db()  # Create tables if they don't exist
 
+    # Factory reset on startup — wipe all user data before anything else
+    if settings.factory_reset_on_startup:
+        from app.utils.system_reset import perform_startup_reset
+
+        perform_startup_reset()
+
     # Load settings from database after DB initialization
     from app.database import SessionLocal
     from app.utils.config_loader import load_settings_from_db