fix: 移除所有权限身份显示，QR上传布局还原为initial commit样式

frontend/src/App.vue

@@ -16,7 +16,6 @@
           >
             <template v-if="auth.isLoggedIn">
               👤 {{ auth.user.display_name || auth.user.username }}
-              <span style="font-size:10px;background:rgba(255,255,255,0.2);padding:2px 7px;border-radius:8px;margin:0 3px;vertical-align:middle;font-weight:400;letter-spacing:0">{{ roleLabel }}</span>
               ▾
             </template>
             <template v-else>
@@ -70,7 +69,7 @@
 </template>
 
 <script setup>
-import { ref, computed, onMounted, watch } from 'vue'
+import { ref, onMounted, watch } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
 import { useAuthStore } from './stores/auth'
 import { useOilsStore } from './stores/oils'
@@ -88,11 +87,6 @@ const router = useRouter()
 const route = useRoute()
 const showUserMenu = ref(false)
 
-const roleLabel = computed(() => {
-  const map = { admin: '管理员', senior_editor: '高级编辑', editor: '编辑', viewer: '查看者' }
-  return map[auth.user.role] || '查看者'
-})
-
 // Sync ui.currentSection from route on load and navigation
 const routeToSection = { '/': 'search', '/manage': 'manage', '/inventory': 'inventory', '/oils': 'oils', '/projects': 'projects', '/mydiary': 'mydiary', '/audit': 'audit', '/bugs': 'bugs', '/users': 'users' }
 watch(() => route.path, (path) => {