feat(user): 新增公告中心与通知页

frontend/src/layouts/StorefrontLayout.tsx

@@ -32,6 +32,7 @@ export function StorefrontLayout() {
               </Badge>
             </Link>
             <Link to="/seller/listings">卖家中心</Link>
+            <Link to="/announcements">公告</Link>
             <a href="/#process">流程</a>
             <a href="/#rules">规则</a>
           </nav>
@@ -52,6 +53,16 @@ export function StorefrontLayout() {
                       label: '我的消息',
                       onClick: () => navigate('/messages'),
                     },
+                    {
+                      key: 'notifications',
+                      label: '我的通知',
+                      onClick: () => navigate('/notifications'),
+                    },
+                    {
+                      key: 'announcements',
+                      label: '公告中心',
+                      onClick: () => navigate('/announcements'),
+                    },
                     {
                       key: 'wallet',
                       label: '我的钱包',