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/vite.config.js

@@ -0,0 +1,33 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  build: {
+    outDir: 'dist',
+    emptyOutDir: true,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          vue: ['vue', 'vue-router'],
+          http: ['axios'],
+        },
+      },
+    },
+  },
+  server: {
+    host: true,
+    port: 5173,
+    strictPort: false,
+    proxy: {
+      '/api': {
+        target: 'http://127.0.0.1:5001',
+        changeOrigin: true,
+      },
+      '/qrcode.png': {
+        target: 'http://127.0.0.1:5001',
+        changeOrigin: true,
+      },
+    },
+  },
+})