feat: Vue SPA 添加 KDocs 在线状态显示 + 清理废弃模板

功能更新：
- AccountsPage.vue: 工具栏显示 KDocs 在线状态（就绪/离线）
- settings.js: 添加 fetchKdocsStatus API 函数
- 每60秒自动刷新状态

代码清理：
- 删除废弃的 legacy 模板文件（约170KB）
  - templates/index.html
  - templates/login.html
  - templates/register.html
  - templates/reset_password.html

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app-frontend/src/api/settings.js

@@ -39,3 +39,8 @@ export async function updateKdocsSettings(payload) {
   const { data } = await publicApi.post('/user/kdocs', payload)
   return data
 }
+
+export async function fetchKdocsStatus() {
+  const { data } = await publicApi.get('/kdocs/status')
+  return data
+}

app-frontend/src/pages/AccountsPage.vue

@@ -15,7 +15,7 @@ import {
   updateAccount,
   updateAccountRemark,
 } from '../api/accounts'
-import { fetchKdocsSettings, updateKdocsSettings } from '../api/settings'
+import { fetchKdocsSettings, fetchKdocsStatus, updateKdocsSettings } from '../api/settings'
 import { fetchRunStats } from '../api/stats'
 import { useSocket } from '../composables/useSocket'
 import { useUserStore } from '../stores/user'
@@ -61,6 +61,14 @@ watch(batchEnableScreenshot, (value) => {
 const kdocsAutoUpload = ref(false)
 const kdocsSettingsLoading = ref(false)
 
+// KDocs 在线状态
+const kdocsStatus = reactive({
+  enabled: false,
+  online: false,
+  message: '',
+})
+const kdocsStatusLoading = ref(false)
+
 const addOpen = ref(false)
 const editOpen = ref(false)
 const upgradeOpen = ref(false)
@@ -205,6 +213,22 @@ async function loadKdocsSettings() {
   }
 }
 
+async function loadKdocsStatus() {
+  kdocsStatusLoading.value = true
+  try {
+    const data = await fetchKdocsStatus()
+    kdocsStatus.enabled = Boolean(data?.enabled)
+    kdocsStatus.online = Boolean(data?.online)
+    kdocsStatus.message = data?.message || ''
+  } catch {
+    kdocsStatus.enabled = false
+    kdocsStatus.online = false
+    kdocsStatus.message = ''
+  } finally {
+    kdocsStatusLoading.value = false
+  }
+}
+
 async function onToggleKdocsAutoUpload(value) {
   kdocsSettingsLoading.value = true
   try {
@@ -542,6 +566,8 @@ watch(shouldPollStats, (running, prevRunning) => {
   syncStatsPolling(prevRunning)
 })
 
+let kdocsStatusTimer = null
+
 onMounted(async () => {
   if (!userStore.vipInfo) {
     userStore.refreshVipInfo().catch(() => {
@@ -553,13 +579,18 @@ onMounted(async () => {
 
   await refreshAccounts()
   await loadKdocsSettings()
+  await loadKdocsStatus()
   await refreshStats()
   syncStatsPolling()
+
+  // 每60秒刷新 KDocs 状态
+  kdocsStatusTimer = window.setInterval(() => loadKdocsStatus(), 60_000)
 })
 
 onBeforeUnmount(() => {
   if (unbindSocket) unbindSocket()
   stopStatsPolling()
+  if (kdocsStatusTimer) window.clearInterval(kdocsStatusTimer)
 })
 </script>
 
@@ -650,6 +681,9 @@ onBeforeUnmount(() => {
             @change="onToggleKdocsAutoUpload"
           />
           <span class="app-muted">表格(测试)</span>
+          <el-tag v-if="kdocsStatus.enabled" :type="kdocsStatus.online ? 'success' : 'warning'" size="small" effect="plain">
+            {{ kdocsStatus.online ? '✅ 就绪' : '⚠️ 离线' }}
+          </el-tag>
         </div>
 
         <div class="toolbar-right">