fix(tech-graph): manifest 登记 GET /api/py/chat/suggested-questions

对齐 api/index.py chat_suggested_questions，修复 manifest_check CI。

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: CyningMM

docs/_tech_graph/_manifest.json

@@ -52,6 +52,15 @@
         "symbol": "chat_history"
       }
     },
+    {
+      "method": "GET",
+      "path": "/api/py/chat/suggested-questions",
+      "handler": "chat_suggested_questions",
+      "anchor": {
+        "path": "api/index.py",
+        "symbol": "chat_suggested_questions"
+      }
+    },
     {
       "method": "POST",
       "path": "/api/py/chain/chat",