Upgrade allow adding image in ticket details page comment section

app/__init__.py

@@ -133,10 +133,23 @@ def create_app(config_name=None):
     with app.app_context():
         db.create_all()
         _seed_admin(app)
+        _seed_settings()
 
     return app
 
 
+def _seed_settings():
+    """Ensure all required system settings exist with safe defaults."""
+    from app.models import SystemSetting
+    defaults = [
+        ('registration_enabled', 'true', 'Allow new users to self-register via /auth/register'),
+    ]
+    for key, value, description in defaults:
+        if SystemSetting.get(key) is None:
+            SystemSetting.set(key, value, description)
+    db.session.commit()
+
+
 def _seed_admin(app):
     """Create the default admin account if none exists."""
     from app.models import User, UserRole