feat: 大部分注册登录功能

Co-authored-by: Copilot <copilot@github.com>

app/utils/user.ts

@@ -0,0 +1,27 @@
+/** 获取错误消息 */
+export const getErrorMessage = (error: unknown, fallbackMessage: string) => {
+  const fetchError = error as {
+    data?: unknown;
+    message?: string;
+    response?: {
+      _data?: unknown;
+    };
+  };
+
+  const errorData = fetchError.data ?? fetchError.response?._data;
+
+  if (typeof errorData === "string") {
+    return errorData;
+  }
+
+  if (
+    errorData &&
+    typeof errorData === "object" &&
+    "msg" in errorData &&
+    typeof errorData.msg === "string"
+  ) {
+    return errorData.msg;
+  }
+
+  return fetchError.message || fallbackMessage;
+};