feat(web): 桌面端前端 Web 独立部署适配——浏览器降级桥+登录态引导+页面动态修正

- 新增 web-fallback.ts：无 pywebview 时以浏览器能力降级（文件选择/上传/模板下载/配置），
  其余桌面能力（enqueue_json/vc_*/folder 选择等）保持 undefined 交由页面既有请在本地客户端中打开提示
- 新增 ensure-auth.ts：无 uid 时经 /newApi/check_login 恢复登录态，无 token/失效跳登录页；
  21 个入口 main.ts 挂载前先引导（桌面端已注入 uid 时零开销）
- pywebview.ts：getPywebviewApi() 在纯浏览器环境返回降级桥；新增 isDesktopRuntime 标志
  （首页更新面板/退出链接据此区分桌面与 Web）；hasPywebview 语义修正为真实桥判定
- 登录页跳转、首页登出链接、品牌检测页 hasBridge 判定（select_brand_folder 存在性）适配 Web

frontend-vue/src/pages/brand/components/BrandBrandTab.vue

@@ -148,7 +148,8 @@ const runMode = ref<'immediate' | 'queue'>('immediate')
 const submitting = ref(false)
 const tasks = ref<BrandTaskItem[]>([])
 
-const hasBridge = computed(() => Boolean(getPywebviewApi()))
+// 品牌检测由桌面客户端本地执行：以"文件夹选择"桥（Web 降级桥不提供）判定桌面运行时，浏览器下仅可预览
+const hasBridge = computed(() => Boolean(getPywebviewApi()?.select_brand_folder))
 const hasUid = computed(() => {
   const raw = typeof window === 'undefined' ? '' : window.localStorage.getItem('uid') || ''
   const numeric = Number(raw.trim())

frontend-vue/src/pages/home/DesktopHomePage.vue

@@ -4,6 +4,7 @@
       <span class="header-title">数富AI</span>
       <div class="header-right">
         <button
+          v-if="isDesktopRuntime"
           type="button"
           class="header-update-btn"
           title="检测更新"
@@ -25,7 +26,7 @@
           </div>
         </div>
         <span class="username-text">{{ username || '未登录' }}</span>
-        <a href="/logout" class="logout-link">退出</a>
+        <a :href="logoutHref" class="logout-link">退出</a>
       </div>
     </header>
 
@@ -78,6 +79,7 @@
 import { computed, onMounted, ref } from 'vue'
 import { requestGetJson } from '@/shared/api/http'
 import { buildJavaUrl } from '@/shared/api/url'
+import { isDesktopRuntime } from '@/shared/bridges/pywebview'
 import { resolvePageHref } from '@/shared/page-prefix'
 
 const username = ref('')
@@ -88,6 +90,11 @@ const updateReady = ref(false)
 const updateFileUrl = ref('')
 const toastText = ref('')
 
+// 桌面端走 Flask /logout（清 cookie 302 登录页）；Web 独立部署 / dev 跳登录页并清本地 token（login.html?logout=1）
+const logoutHref = computed(() =>
+  isDesktopRuntime.value ? '/logout' : `${resolvePageHref('/new_web_source/login.html')}?logout=1`,
+)
+
 type PermissionState = { amazon: boolean; video: boolean; image: boolean }
 const permissionState = ref<PermissionState>({ amazon: false, video: false, image: false })
 const permissionUnavailable = ref(false)
@@ -95,7 +102,7 @@ const permissionReady = ref(false)
 
 const amazonHref = computed(() => resolvePageHref('/new_web_source/amazon-console.html'))
 const videoHref = computed(() => resolvePageHref('/new_web_source/image-video.html'))
-const imageHref = computed(() => resolvePageHref('/image'))
+const imageHref = computed(() => resolvePageHref('/new_web_source/image.html'))
 
 const canShow = computed(() =>
   permissionUnavailable.value ? { amazon: true, video: true, image: true } : permissionState.value,
@@ -172,7 +179,11 @@ async function loadCurrentUser() {
   try {
     const localName = typeof window === 'undefined' ? '' : window.localStorage.getItem('username') || ''
     if (localName) username.value = localName
-    const resp = await window.fetch('/newApi/check_login', { credentials: 'include' })
+    const token = typeof window === 'undefined' ? '' : window.localStorage.getItem('aiimage_auth_token') || ''
+    const resp = await window.fetch('/newApi/check_login', {
+      credentials: 'include',
+      headers: token ? { Authorization: `Bearer ${token}` } : {},
+    })
     const body = await resp.json().catch(() => ({}))
     if (body?.success && body.data) {
       if (body.data.username) username.value = body.data.username
@@ -257,7 +268,10 @@ async function doUpdate() {
 onMounted(() => {
   void loadCurrentUser()
   void loadPermissions()
-  void fetchVersion().catch(() => undefined)
+  // 版本检测/更新由桌面客户端 Flask 提供，Web 版不发起
+  if (isDesktopRuntime.value) {
+    void fetchVersion().catch(() => undefined)
+  }
 })
 </script>
 

frontend-vue/src/pages/image-video/ImageVideoPage.vue

@@ -2,7 +2,7 @@
   <div v-if="currentView === 'menu'" class="image-video-page">
     <header class="page-header">
       <span class="header-title">数富AI</span>
-      <a class="back-link" href="/home">返回首页</a>
+      <a class="back-link" :href="goHome()">返回首页</a>
     </header>
 
     <main class="entrances" :class="{ 'is-loading': permissionsLoading }" aria-label="视频与图片入口">
@@ -21,9 +21,12 @@
       <button v-if="hasMenuPermission('mix-video')" type="button" class="entrance-btn" @click="showSoon('混剪')">
         混剪
       </button>
-      <a v-if="hasMenuPermission('image')" class="entrance-btn" href="/image">
+      <a v-if="hasMenuPermission('image') && isDesktop" class="entrance-btn" href="/new_web_source/image.html">
         图片
       </a>
+      <button v-else-if="hasMenuPermission('image')" type="button" class="entrance-btn" @click="showDesktopOnly('图片工作台')">
+        图片
+      </button>
     </main>
 
     <div class="toast" :class="{ show: Boolean(statusText), error: statusType === 'error' }">
@@ -75,10 +78,22 @@ import BrandTopBar from '@/pages/brand/components/BrandTopBar.vue'
 import DeliveryVideoWorkspace from '@/pages/image-video/components/DeliveryVideoWorkspace.vue'
 import { getCurrentUserAppColumnKeys } from '@/shared/api/permission'
 import { getPywebviewApi } from '@/shared/bridges/pywebview'
+import { isDesktopClientPage } from '@/shared/page-prefix'
 import DownloadProgressPanel from '@/shared/components/DownloadProgressPanel.vue'
 
 type ViewMode = 'menu' | 'delivery'
 
+const isDesktop = isDesktopClientPage()
+
+function goHome() {
+  // 桌面端首页是 Flask /home（重定向到 Vue home）；dev 下是 MPA 的 /home.html
+  return isDesktop ? '/home' : '/home.html'
+}
+
+function showDesktopOnly(name: string) {
+  showStatus(`${name}为桌面客户端功能，请在本地客户端中打开`, 'error')
+}
+
 const currentView = ref<ViewMode>('menu')
 const allowedColumnKeys = ref(new Set<string>())
 const permissionsLoading = ref(true)
@@ -184,7 +199,7 @@ onBeforeUnmount(() => {
 async function launchDesktop() {
   const api = getPywebviewApi()
   if (!api?.launch_yaoayanui) {
-    showStatus('当前环境不支持拉起桌面端', 'error')
+    showStatus('数字人为桌面客户端程序：请在本机客户端中打开后再点击', 'error')
     return
   }
 
@@ -246,7 +261,7 @@ async function launchDesktop() {
   font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
   background:
     linear-gradient(rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.5)),
-    url('/static/bg.jpg') center/cover no-repeat,
+    url('/bg.jpg') center/cover no-repeat,
     #eef3f7;
 }
 

frontend-vue/src/pages/login/DesktopLoginPage.vue

@@ -53,6 +53,7 @@
 
 <script setup lang="ts">
 import { onMounted, ref } from 'vue'
+import { resolvePageHref } from '@/shared/page-prefix'
 
 const AUTH_TOKEN_KEY = 'aiimage_auth_token'
 const DEVICE_ID_KEY = 'aiimage_device_id'
@@ -185,7 +186,8 @@ async function submitLogin() {
       /* cookie 同步失败不阻塞跳转（页面仍可读 localStorage） */
     }
     clearAppPermissionCaches()
-    window.location.href = isDesktopClient() ? '/home' : '/home.html'
+    // 桌面端走 Flask /home；Web 独立部署（路径含 /new_web_source）与 dev 走 resolvePageHref 归一
+    window.location.href = isDesktopClient() ? '/home' : resolvePageHref('/new_web_source/home.html')
   } catch {
     errorMessage.value = '网络异常，请稍后重试'
   } finally {