feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/init_db.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3.11
+
+from models import init_database, create_initial_admin
+
+if __name__ == "__main__":
+    print("Initialisiere Datenbank...")
+    init_database()
+    
+    print("Erstelle initialen Admin-Benutzer...")
+    success = create_initial_admin(
+        email="admin@mercedes-benz.com",
+        password="744563017196A",
+        name="System Administrator",
+        username="admin"
+    )
+    
+    if success:
+        print("Admin-Benutzer erfolgreich erstellt.")
+        print("Login-Daten:")
+        print("  Benutzername: admin")
+        print("  Passwort: 744563017196A")
+    else:
+        print("Admin-Benutzer konnte nicht erstellt werden (existiert bereits?).")
+    
+    print("Datenbank-Initialisierung abgeschlossen.")