refactor(structure): reorganize app layout

BREAKING CHANGE: root backend/frontend directories and old run/manage entrypoints were removed. Use apps/backend, apps/frontend, and python main.py commands instead.

apps/frontend/src/api/client.js

@@ -0,0 +1,75 @@
+import axios from 'axios';
+
+// 创建 axios 实例
+const client = axios.create({
+  baseURL: import.meta.env.VITE_API_BASE_URL || '',
+  timeout: 30000,
+  headers: {
+    'Content-Type': 'application/json',
+  },
+});
+
+// 请求拦截器 - 添加 Token
+client.interceptors.request.use(
+  config => {
+    const token = localStorage.getItem('token');
+    if (token) {
+      config.headers.Authorization = `Bearer ${token}`;
+    }
+    return config;
+  },
+  error => {
+    return Promise.reject(error);
+  }
+);
+
+// 响应拦截器 - 统一错误处理
+client.interceptors.response.use(
+  response => {
+    return response.data;
+  },
+  error => {
+    if (error.response) {
+      // 服务器返回错误状态码
+      const { status, data } = error.response;
+
+      if (status === 401) {
+        // JWT token 过期或无效：需要重新登录
+        // 注意：打卡业务的 authorization token 过期不会影响网站登录状态
+        localStorage.removeItem('token');
+        localStorage.removeItem('user');
+
+        // 延迟跳转到登录页
+        setTimeout(() => {
+          if (window.location.pathname !== '/login') {
+            window.location.href = '/login';
+          }
+        }, 100);
+      }
+
+      // 返回统一的错误对象
+      return Promise.reject({
+        status,
+        message: data.detail || data.message || '请求失败',
+        data,
+      });
+    } else if (error.request) {
+      // 请求已发出但没有收到响应（超时或网络错误）
+      return Promise.reject({
+        status: 0,
+        message:
+          error.code === 'ECONNABORTED' ? '请求超时，请稍后重试' : '网络错误，请检查您的网络连接',
+        data: null,
+      });
+    } else {
+      // 发生了触发请求错误的问题
+      return Promise.reject({
+        status: 0,
+        message: error.message || '请求配置错误',
+        data: null,
+      });
+    }
+  }
+);
+
+export default client;