feat(backend): add opendal storage for file payload and postgres record for metadata, add CORS layer

backend/src/error.rs

@@ -10,6 +10,7 @@ pub enum LoftError {
     AuthFailTokenWrongFormat,
     AuthFailCtxNotInRequestExt,
     FileIdNotFound,
+    UndefinedErrorType,
 }
 
 impl fmt::Display for LoftError {
@@ -34,6 +35,10 @@ impl IntoResponse for LoftError {
                 info!("NOT_FOUND");
                 StatusCode::NOT_FOUND.into_response()
             }
+            Self::UndefinedErrorType => {
+                info!("INTERNAL_SERVER_ERROR");
+                StatusCode::INTERNAL_SERVER_ERROR.into_response()
+            }
         }
     }
 }