Initial FastAPI admin auth scaffold

app/lib/response/__init__.py

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+"""Response helpers."""

app/lib/response/admin_return.py

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+from app.lib.response.common_return import CommonReturn
+
+
+class AdminReturn(CommonReturn):
+    def after_success(self, response: dict) -> dict:
+        return response

app/lib/response/common_return.py

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+from app.constants.result_code import ResultCode
+
+
+class CommonReturn:
+    def success(
+        self,
+        message: str = "success",
+        data: dict | list | None = None,
+        code: int | ResultCode = ResultCode.SUCCESS,
+    ) -> dict:
+        return self.after_success(
+            {
+                "code": int(code),
+                "message": message,
+                "data": data if data is not None else {},
+            }
+        )
+
+    def error(
+        self,
+        message: str = "failed",
+        code: int | ResultCode = ResultCode.ERROR,
+        data: dict | None = None,
+    ) -> dict:
+        return self.after_success(
+            {
+                "code": int(code),
+                "message": message,
+                "data": data or {},
+            }
+        )
+
+    def after_success(self, response: dict) -> dict:
+        raise NotImplementedError