feat(vip): 限制底部栏自定义功能为VIP专享

非VIP用户尝试配置底部栏时将显示会员购买弹窗，
只有VIP会员才能自由开启或关闭导航标签。
包含会员权益说明的国际化支持和存储结构重构。

components/model/MembershipModal.tsx

@@ -194,6 +194,20 @@ export function MembershipModal({ visible, onClose, onPurchaseSuccess }: Members
         vipText: t('membershipModal.benefits.permissions.notSupported')
       }
     },
+    {
+      title: t('membershipModal.benefits.items.tabBarCustomization.title'),
+      description: t('membershipModal.benefits.items.tabBarCustomization.description'),
+      vip: {
+        type: 'exclusive',
+        text: t('membershipModal.benefits.permissions.fullSupport'),
+        vipText: t('membershipModal.benefits.permissions.unlimited')
+      },
+      regular: {
+        type: 'exclusive',
+        text: t('membershipModal.benefits.permissions.notSupported'),
+        vipText: t('membershipModal.benefits.permissions.notSupported')
+      }
+    },
   ];
 
   // 根据选中的产品生成tips内容