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/composables/useLivePoll.js

@@ -0,0 +1,60 @@
+import { ref, onUnmounted } from 'vue'
+
+/**
+ * 自适应间隔轮询：tick 返回后按 getInterval() 调度下一次
+ * @param {() => Promise<void>|void} tickFn
+ * @param {() => number} getIntervalMs
+ */
+export function useLivePoll(tickFn, getIntervalMs = () => 1000) {
+  const lastTickAt = ref(null)
+  const ticking = ref(false)
+  let timer = null
+  let inFlight = false
+  let running = false
+
+  async function runTick() {
+    if (inFlight) return
+    inFlight = true
+    ticking.value = true
+    try {
+      await tickFn()
+      lastTickAt.value = Date.now()
+    } catch (e) {
+      console.error('[livePoll]', e)
+    } finally {
+      inFlight = false
+      ticking.value = false
+    }
+  }
+
+  function scheduleNext() {
+    if (!running) return
+    clearTimeout(timer)
+    const ms = Math.max(500, getIntervalMs())
+    timer = setTimeout(async () => {
+      await runTick()
+      scheduleNext()
+    }, ms)
+  }
+
+  function start() {
+    if (running) return
+    running = true
+    runTick().then(scheduleNext)
+  }
+
+  function stop() {
+    running = false
+    clearTimeout(timer)
+    timer = null
+  }
+
+  function restart() {
+    stop()
+    start()
+  }
+
+  onUnmounted(stop)
+
+  return { start, stop, restart, runTick, lastTickAt, ticking }
+}