重构为 HTTP SSO 扫码方案并引入 Vue3 前端

移除 Playwright 浏览器自动化，改用 passport/SSO HTTP 接口获取二维码与轮询登录；后端模块化拆分，前端替换为 Vue3 SPA。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/api/http.js

@@ -0,0 +1,26 @@
+import axios from 'axios'
+
+const http = axios.create({
+  baseURL: import.meta.env.VITE_API_BASE || '',
+  headers: { 'Content-Type': 'application/json' },
+  timeout: 120000,
+})
+
+export async function post(path, body = {}, axiosConfig = {}) {
+  const { data } = await http.post(path, body, axiosConfig)
+  return data
+}
+
+export async function get(path, params = {}, axiosConfig = {}) {
+  const { data } = await http.get(path, { ...axiosConfig, params })
+  return data
+}
+
+export function formatApiError(err, fallback = '请求失败') {
+  const d = err?.response?.data
+  if (typeof d?.message === 'string' && d.message.trim()) return d.message
+  if (typeof d === 'string' && d.trim()) return d
+  return err?.message || fallback
+}
+
+export default http