add fastapi init

chat/utils/jwt.py

@@ -0,0 +1 @@
+# 预留：如需JWT校验可在此实现 

chat/utils/resp.py

@@ -0,0 +1,16 @@
+from typing import Any, Optional
+from pydantic import BaseModel
+
+class CommonResponse(BaseModel):
+    code: int = 0
+    message: str = "success"
+    data: Any = None
+    error: Optional[Any] = None
+
+
+def resp_success(data=None, message="success"):
+    return CommonResponse(code=0, message=message, data=data, error=None)
+
+
+def resp_error(message="error", code=1, error=None):
+    return CommonResponse(code=code, message=message, data=None, error=error)