Update app.py

app.py

@@ -4,11 +4,13 @@ from fastapi.responses import FileResponse
 import uvicorn
 import os
 from pathlib import Path
+import mimetypes
 
 from utils import log
 from chat_handler import router as chat_router  # ← start_session & chat
 from admin_routes import router as admin_router  # ← Admin API endpoints
 from spark_startup import run_in_thread
+from session import session_store  # ← Import session_store
 
 # Fix MIME types for JavaScript files
 mimetypes.add_type("application/javascript", ".js")