Update Python version to 3.11 and add pytest-asyncio as a development dependency

Author: JohnnyWan1123

.claude/settings.local.json

@@ -3,7 +3,8 @@
     "allow": [
       "Bash(pytest:*)",
       "Bash(python -m pytest:*)",
-      "Bash(python:*)"
+      "Bash(python:*)",
+      "Bash(poetry lock:*)"
     ]
   }
 }