fix default uid in chat

src/api/v1/router.py

@@ -29,7 +29,7 @@ async def insurance_chat(request: models.InsuranceChatRequest):
         result = await chat_service.process_insurance_chat(
             message=request.message,
             session_id=request.session_id,
-            uid=str(request.userId),
+            uid=str(request.userId) if request.userId else None,
             current_page=current_page,
             application=application,
         )