Implement Flask-Migrate for database migrations in app.py, disable CSRF protection, and update requirements.txt to include Flask-Migrate. Remove obsolete systades.db file and add migration configuration files for Alembic.

app.py

@@ -18,7 +18,7 @@ from sqlalchemy.sql import func
 from openai import OpenAI
 from dotenv import load_dotenv
 from flask_socketio import SocketIO, emit
-from flask_wtf.csrf import CSRFProtect
+from flask_migrate import Migrate
 
 # Modelle importieren
 from models import (
@@ -42,6 +42,7 @@ app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{db_path}'
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 app.config['PERMANENT_SESSION_LIFETIME'] = timedelta(days=365)  # Langlebige Session für Dark Mode-Einstellung
 app.config['UPLOAD_FOLDER'] = os.getenv('UPLOAD_FOLDER', os.path.join(os.getcwd(), 'uploads'))
+app.config['WTF_CSRF_ENABLED'] = False
 
 # OpenAI API-Konfiguration
 api_key = os.environ.get("OPENAI_API_KEY")
@@ -94,8 +95,7 @@ from utils.db_check import check_db_connection, initialize_db_if_needed
 # SocketIO initialisieren
 socketio = SocketIO(app)
 
-# Security
-csrf = CSRFProtect(app)
+migrate = Migrate(app, db)
 
 def create_default_categories():
     """Erstellt die Standardkategorien für die Mindmap"""