feat: 权限细化、商业认证跳转、UI改进

权限:
- viewer 管理配方页只显示我的配方，隐藏公共配方库和工具栏
- 高级编辑者可看到精油价目信息不全的红色提示
- 商业核算删除按钮仅管理员可见
- 搜索未收录通知只发管理员和高级编辑者

Tab 可见性:
- 所有用户可见：配方查询、管理配方、个人库存、精油价目、商业核算
- 需登录的 tab 点击弹登录框，登录后跳转
- 操作日志/Bug/用户管理仅管理员可见

商业核算:
- 未认证用户可看项目列表，点详情提示去认证
- 跳转到我的账户页商业认证区域并自动滚动

其他:
- 我的配方和收藏配方默认折叠

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

frontend/src/views/Projects.vue

@@ -3,7 +3,7 @@
     <!-- Project List -->
     <div class="toolbar">
       <h3 class="page-title">💼 商业核算</h3>
-      <button class="btn-primary" @click="createProject">+ 新建项目</button>
+      <button v-if="auth.isBusiness" class="btn-primary" @click="createProject">+ 新建项目</button>
     </div>
 
     <div v-if="!selectedProject" class="project-list">
@@ -23,7 +23,7 @@
             成本 {{ oils.fmtPrice(oils.calcCost(p.ingredients)) }}
           </span>
         </div>
-        <div class="proj-actions" @click.stop>
+        <div v-if="auth.isAdmin" class="proj-actions" @click.stop>
           <button class="btn-icon-sm" @click="deleteProject(p)" title="删除">🗑️</button>
         </div>
       </div>
@@ -177,6 +177,7 @@
 
 <script setup>
 import { ref, computed, onMounted } from 'vue'
+import { useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/auth'
 import { useOilsStore } from '../stores/oils'
 import { useRecipesStore } from '../stores/recipes'
@@ -188,6 +189,14 @@ const auth = useAuthStore()
 const oils = useOilsStore()
 const recipeStore = useRecipesStore()
 const ui = useUiStore()
+const router = useRouter()
+
+async function showCertPrompt() {
+  const ok = await showConfirm('此功能需要商业认证，是否前往申请认证？', { okText: '去认证', cancelText: '取消' })
+  if (ok) {
+    router.push('/mydiary?tab=account&section=biz-cert')
+  }
+}
 
 const projects = ref([])
 const selectedProject = ref(null)
@@ -237,6 +246,10 @@ async function createProject() {
 }
 
 function selectProject(p) {
+  if (!auth.isBusiness) {
+    showCertPrompt()
+    return
+  }
   selectedProject.value = {
     ...p,
     ingredients: (p.ingredients || []).map(i => ({ ...i })),