fix(index): replace huiwings.cn iframe with in-app role home redirect

Logged-in users on music-room.moicen.com saw a blank center because iframe
targeted huiwings.cn (cross-origin / no session). Redirect to /student/home,
/teacher/home, /admin/teachers, /tester, or supervisor path on same origin.

Made-with: Cursor

src/pages/index.vue

@@ -22,19 +22,21 @@
             ></van-grid-item>
           </van-grid>
         </template>
-        <iframe v-else src="https://huiwings.cn"></iframe>
+        <div v-else class="role-home-redirect">
+          <van-loading size="24px" vertical>进入工作台…</van-loading>
+        </div>
       </template>
-      <iframe v-else src="https://huiwings.cn"></iframe>
+      <van-empty v-else description="账号未启用或未通过注册审核" />
     </template>
-    <iframe v-if="!has_login" src="https://huiwings.cn"></iframe>
+    <van-empty v-if="!has_login" description="请返回微信小程序完成登录" />
   </div>
 </template>
 
 <script lang="ts">
-import { computed, defineComponent, onMounted } from "vue";
+import { computed, defineComponent, onMounted, watchEffect } from "vue";
 import useUser from "~/store/user";
 import { useRouter } from "vue-router";
-import { HtyBaseRoles, HtyStates, WxScenes, UserStates } from "~/types";
+import { HtyBaseRoles, HtyStates, HtySuperRoles, WxScenes, UserStates } from "~/types";
 import {
   Button,
   CellGroup,
@@ -43,6 +45,7 @@ import {
   Form,
   Grid,
   GridItem,
+  Loading,
   Picker,
   Popup,
   Radio,
@@ -65,6 +68,7 @@ export default defineComponent({
     [RadioGroup.name!]: RadioGroup,
     [Form.name!]: Form,
     [Popup.name!]: Popup,
+    [Loading.name!]: Loading,
   },
   props: ["params"],
   setup({ params }) {
@@ -143,6 +147,28 @@ export default defineComponent({
       }
     }
 
+    const landingPathForRole = (role: string | undefined): string | null => {
+      if (!role) return null
+      if (role === HtyBaseRoles.STUDENT) return '/student/home'
+      if (role === HtyBaseRoles.TEACHER) return '/teacher/home'
+      if (role === HtySuperRoles.ADMIN) return '/admin/teachers'
+      if (role === HtySuperRoles.TESTER) return '/tester'
+      if (role === HtySuperRoles.SUPERVISOR) return '/supervisor/subsidiaries'
+      return '/guest/profile'
+    }
+
+    watchEffect(() => {
+      if (router.currentRoute.value.path !== '/') return
+      if (!store.current.hty_id) return
+      if (!store.current.enabled || !store.current.is_registered) return
+      if (!store.currentRole) return
+      if (store.currentRole === HtyBaseRoles.STUDENT && store.teachers.mine.length === 0) return
+      const target = landingPathForRole(store.currentRole)
+      if (target && target !== '/') {
+        void router.replace(target)
+      }
+    })
+
     const chooseTeacher = async (teacher_id: string, teacher_name: string) => {
       await showConfirmDialog({message: "确认选择【" + teacher_name + "】老师？"})
       await claimTeacher(store.current.hty_id, teacher_id);
@@ -180,10 +206,12 @@ export default defineComponent({
     color: #ed6a0c;
   }
 
-  iframe {
-    width: 100%;
-    height: 100%;
-    border: none;
+  .role-home-redirect {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 40vh;
+    padding: 1rem;
   }
 }
 </style>