Step F1：前端工程骨架 & 登录鉴权

frontend/src/api/auth.ts

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+import type { AxiosResponse } from "axios";
+import api, { apiGet, apiPost } from "./axios";
+import type { UserMeResponse, LoginRequest, LoginResponse } from "../types/api";
+
+export const login = (payload: LoginRequest): Promise<AxiosResponse<LoginResponse>> =>
+  apiPost<LoginResponse>("/api/v1/auth/login", payload);
+
+export const fetchMe = (): Promise<AxiosResponse<UserMeResponse>> => apiGet<UserMeResponse>("/api/v1/auth/me");
+
+export default api;

frontend/src/api/axios.ts

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+import axios, { AxiosError, AxiosInstance, AxiosRequestConfig, AxiosResponse } from "axios";
+import { ElMessage } from "element-plus";
+import router from "../router";
+import { getToken, clearToken } from "../utils/auth";
+import type { ApiError } from "../types/api";
+
+const instance: AxiosInstance = axios.create({
+  baseURL: "/",
+  timeout: 15000,
+});
+
+instance.interceptors.request.use((config: AxiosRequestConfig) => {
+  const token = getToken();
+  if (token) {
+    config.headers = config.headers || {};
+    config.headers.Authorization = `Bearer ${token}`;
+  }
+  return config;
+});
+
+instance.interceptors.response.use(
+  (response: AxiosResponse) => response,
+  async (error: AxiosError<ApiError>) => {
+    const status = error.response?.status;
+    const data = error.response?.data;
+    if (status === 401) {
+      clearToken();
+      ElMessage.error(data?.message || "登录已过期，请重新登录");
+      router.push("/login");
+    } else if (data?.message) {
+      ElMessage.error(data.message);
+    } else {
+      ElMessage.error("请求失败，请稍后重试");
+    }
+    return Promise.reject(error);
+  }
+);
+
+export const apiGet = <T = unknown>(url: string, config?: AxiosRequestConfig) => instance.get<T>(url, config);
+export const apiPost = <T = unknown>(url: string, data?: unknown, config?: AxiosRequestConfig) =>
+  instance.post<T>(url, data, config);
+export const apiPatch = <T = unknown>(url: string, data?: unknown, config?: AxiosRequestConfig) =>
+  instance.patch<T>(url, data, config);
+
+export default instance;