feat: 权限修复、搜索改进、滑动切换、通知badge

权限:
- viewer 不能编辑公共配方（前端+后端双重限制）
- viewer 管理配方页只显示"我的配方"
- 取消 token 链接登录，改为自注册+管理员分配角色
- 用户管理页去掉创建用户和复制链接，禁止设管理员
- 修复改权限 API 路径错误

搜索:
- 模糊匹配+同义词扩展（37组），精确/相似分层
- 精确匹配不搜精油成分（避免"西班牙牛至"污染）
- 所有搜索结果底部加"通知编辑添加"按钮

UI:
- 顶部 tab 栏按用户角色显示，切换时居中滚动
- 左右滑动按 visibleTabs 顺序切换 tab
- 用户名旁红色通知数 badge

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/UserMenu.vue

@@ -163,7 +163,11 @@ function handleLogout() {
   auth.logout()
   ui.showToast('已退出登录')
   emit('close')
-  router.push('/')
+  if (router.currentRoute.value.meta.requiresAuth) {
+    router.push('/')
+  } else {
+    window.location.reload()
+  }
 }
 
 onMounted(loadNotifications)

frontend/src/router/index.js

@@ -10,11 +10,13 @@ const routes = [
     path: '/manage',
     name: 'RecipeManager',
     component: () => import('../views/RecipeManager.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/inventory',
     name: 'Inventory',
     component: () => import('../views/Inventory.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/oils',
@@ -25,26 +27,31 @@ const routes = [
     path: '/projects',
     name: 'Projects',
     component: () => import('../views/Projects.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/mydiary',
     name: 'MyDiary',
     component: () => import('../views/MyDiary.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/audit',
     name: 'AuditLog',
     component: () => import('../views/AuditLog.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/bugs',
     name: 'BugTracker',
     component: () => import('../views/BugTracker.vue'),
+    meta: { requiresAuth: true },
   },
   {
     path: '/users',
     name: 'UserManagement',
     component: () => import('../views/UserManagement.vue'),
+    meta: { requiresAuth: true },
   },
 ]