fix db.create_all() call

Remove the `app` parameter from `db.create_all()` and move the call into an app context to be compatible with Flask-SQLAlchemy version 3.0.

nateman/__init__.py

@@ -73,9 +73,9 @@ def create_app() -> Flask:
     )
 
     db.init_app(app)
-    db.create_all(app=app)
 
     with app.app_context():
+        db.create_all()
         init_db(app)
 
     # Blueprints registrieren