Fix: 增加pythonpath

.vscode/launch.json

@@ -21,6 +21,7 @@
             "purpose": ["debug-test"],
             "console": "integratedTerminal",
             "cwd": "${workspaceFolder}/backend",
+            "env": {"PYTHONPATH": "${workspaceFolder}/backend"},
             "justMyCode": false,
         }
     ]