added migration script for users to add 'No access' roles in app_roles

areas/apps/apps_service.py

@@ -0,0 +1,12 @@
+from .models import App, AppRole
+
+class AppsService:
+    @staticmethod
+    def get_apps():
+        apps = App.query.all()
+        return [{"id": app.id, "name": app.name, "slug": app.slug} for app in apps]
+
+    @staticmethod
+    def get_app_roles():
+        app_roles = AppRole.query.all()
+        return [{"user_id": app_role.user_id, "app_id": app_role.app_id, "role_id": app_role.role_id} for app_role in app_roles]