feat(web): add API client, router, and app layout

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

web/src/api/client.ts

@@ -0,0 +1,24 @@
+import axios from 'axios'
+import { ElMessage } from 'element-plus'
+import type { ApiResponse } from '@/types/jobs'
+
+const apiClient = axios.create({
+  baseURL: '/api/v1',
+})
+
+apiClient.interceptors.response.use(
+  (response) => {
+    return response.data
+  },
+  (error) => {
+    if (error.response?.data) {
+      const apiError = error.response.data as ApiResponse<unknown>
+      ElMessage.error(apiError.error || '请求失败')
+    } else {
+      ElMessage.error('无法连接到后端服务')
+    }
+    return Promise.reject(error)
+  }
+)
+
+export default apiClient