feat: vue3 frontend scaffold + org tree + customer list + chat timeline

M5b viewing frontend for the yunke data-mirror, under yunkes/.

- Scaffold: Vite + Vue 3 + TS, with element-plus, @element-plus/icons-vue,
  pinia, vue-router@4, axios. Dev server on :5173 with /api and /api/media
  proxied to the FastAPI backend on :8000.
- API client (src/api/): axios instance (baseURL '/api') whose response
  interceptor unwraps the axios envelope; typed wrappers (getCustomers,
  getMessages, getDepartments, getStaff) returning Page<T> / arrays; types
  mirroring the backend *Out schemas (Message typed as a permissive superset
  so file_th_url/duration/transcription_text degrade gracefully today and
  light up once MessageOut exposes them).
- Layout: el-header top bar (title + channel switch) + el-aside department
  tree (built from the flat parent_id list via useOrgStore, with search
  filter) + el-main router-view.
- CustomerList (/customers): el-table with channel filter, department filter
  driven by the tree selection (route query), pagination, and row-click into
  the chat timeline (channel + owner_account_id + talker_id).
- ChatTimeline (/chat/:channel/:ownerId/:talkerId): asc-ordered message
  bubbles keyed by is_send (direction) and type (text/image/video/voice/file/
  divider/system/unknown); lands on the most-recent page and prepends older
  pages via load-more with scroll anchoring.
- Home '/' redirects to '/customers'.

npm run build (vue-tsc -b + vite build) is clean.

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

yunkes/src/router/index.ts

@@ -0,0 +1,42 @@
+import { createRouter, createWebHistory, type RouteRecordRaw } from 'vue-router'
+
+// `/` redirects to `/customers`. Chat timeline params are path segments so the
+// URL is shareable + survives refresh:
+//   /chat/:channel/:ownerId/:talkerId
+const routes: RouteRecordRaw[] = [
+  {
+    path: '/',
+    redirect: { name: 'customers' },
+  },
+  {
+    path: '/customers',
+    name: 'customers',
+    component: () => import('@/views/CustomerList.vue'),
+    meta: { title: '客户列表' },
+  },
+  {
+    path: '/chat/:channel/:ownerId/:talkerId',
+    name: 'chat',
+    component: () => import('@/views/ChatTimeline.vue'),
+    props: true,
+    meta: { title: '聊天记录' },
+  },
+  {
+    // Anything else → back to the list.
+    path: '/:pathMatch(.*)*',
+    redirect: { name: 'customers' },
+  },
+]
+
+export const router = createRouter({
+  history: createWebHistory(),
+  routes,
+  scrollBehavior() {
+    return { top: 0 }
+  },
+})
+
+router.afterEach((to) => {
+  const title = (to.meta.title as string | undefined) ?? ''
+  document.title = title ? `${title} · 云客数据镜像` : '云客数据镜像'
+})