功能迁移，页面整体样式修改

offline-backend-20260512/backend/langgraph.json

@@ -7,7 +7,8 @@
   "env": ".env",
   "graphs": {
     "lead_agent": "deerflow.agents:make_lead_agent",
-    "canvas_agent": "deerflow.agents.canvas_agent:make_canvas_agent"
+    "canvas_agent": "deerflow.agents.canvas_agent:make_canvas_agent",
+    "ai_writing": "deerflow.agents.ai_writing.graph:make_ai_writing_graph"
   },
   "auth": {
     "path": "./app/gateway/langgraph_auth.py:auth"