fix: use UnauthorizedAndForceLogout to trigger frontend logout on license expiry

Change license check to raise UnauthorizedAndForceLogout exception instead
of returning generic JSON response. This ensures proper frontend handling:

Frontend behavior (service/base.ts line 588):
- Checks if code === 'unauthorized_and_force_logout'
- Executes globalThis.location.reload()
- Forces user logout and redirect to login page
- Login page displays license expiration UI (already exists)

Response format:
- HTTP 401 (not 403)
- code: "unauthorized_and_force_logout"
- Triggers frontend reload which clears auth state

This completes the license enforcement flow:
1. Backend blocks all business APIs when license expires
2. Backend returns proper error code to trigger logout
3. Frontend reloads and redirects to login
4. Login page shows license expiration message

api/app_factory.py

@@ -1,12 +1,13 @@
 import logging
 import time
 
-from flask import jsonify, request
+from flask import request
 from opentelemetry.trace import get_current_span
 from opentelemetry.trace.span import INVALID_SPAN_ID, INVALID_TRACE_ID
 
 from configs import dify_config
 from contexts.wrapper import RecyclableContextVar
+from controllers.console.error import UnauthorizedAndForceLogout
 from core.logging.context import init_request_context
 from dify_app import DifyApp
 from services.feature_service import FeatureService, LicenseStatus
@@ -61,14 +62,15 @@ def create_flask_app_with_configs() -> DifyApp:
                         LicenseStatus.EXPIRED,
                         LicenseStatus.LOST,
                     ]:
-                        return jsonify({
-                            "code": "license_expired",
-                            "message": (
-                                f"Enterprise license is {system_features.license.status.value}. "
-                                "Please contact your administrator."
-                            ),
-                            "status": system_features.license.status.value,
-                        }), 403
+                        # Raise UnauthorizedAndForceLogout to trigger frontend reload and logout
+                        # Frontend checks code === 'unauthorized_and_force_logout' and calls location.reload()
+                        raise UnauthorizedAndForceLogout(
+                            f"Enterprise license is {system_features.license.status.value}. "
+                            "Please contact your administrator."
+                        )
+                except UnauthorizedAndForceLogout:
+                    # Re-raise to let Flask error handler convert to proper JSON response
+                    raise
                 except Exception:
                     # If license check fails, log but don't block the request
                     # This prevents service disruption if enterprise API is temporarily unavailable