fix(auth): 登录页不再套 MainLayout(public 路由全屏裸渲染)

App.vue 按 route.meta.public 切换:登录页直接出 router-view,其余才带
侧栏布局 — 否则登录页嵌在侧栏旁边,布局错乱。

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

yunkes/src/App.vue

@@ -1,7 +1,15 @@
 <script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
 import MainLayout from '@/layouts/MainLayout.vue'
+
+// 登录页等 public 页面(meta.public)不套 MainLayout — 侧栏导航是登录后
+// 才有的东西,登录页必须全屏裸渲染(router-view 直接出组件)。
+const route = useRoute()
+const isPublic = computed(() => route.meta.public === true)
 </script>
 
 <template>
-  <MainLayout class="yk-app" />
+  <router-view v-if="isPublic" />
+  <MainLayout v-else class="yk-app" />
 </template>