fix: resolve infinite loading on Settings tab and synchronize database

- Manually triggered database table creation for AppSettingsTable.
- Refactored HTMX triggers in index.html to prevent redundant loading.
- Improved provider toggle mechanism with explicit refresh-settings event.
- Simplified router responses for better HTMX integration.

app/routers/router_settings.py

@@ -67,11 +67,7 @@ async def update_settings(
     
     response.headers["HX-Trigger"] = json.dumps({"show-toast": {"message": "Paramètres enregistrés", "type": "success"}})
     
-    return AppSettings(
-        default_lang=settings_obj.default_lang,
-        theme=settings_obj.theme,
-        disabled_providers=settings_obj.disabled_providers
-    )
+    return settings_obj
 
 
 @router.get("/providers/availability")