feat(web): I4 delivery and license SN UI

Add routes, menu entries, platform API helpers, and views for delivery
batches and license SN management.

Made-with: Cursor

web/delivery-platform-ui/src/layout/MainLayout.vue

@@ -15,6 +15,12 @@
         <el-menu-item index="/contracts">
           <span>合同管理</span>
         </el-menu-item>
+        <el-menu-item index="/deliveries">
+          <span>交付管理</span>
+        </el-menu-item>
+        <el-menu-item index="/licenses/sn">
+          <span>许可 SN</span>
+        </el-menu-item>
       </el-menu>
     </el-aside>
     <el-container>