feat(ops-web/site-mappings): add site domain mappings management view

Add a CRUD page for site_domain_mappings with search, pagination, create/
edit/enable/disable/delete actions, and register it in the AppShell nav.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/ops-web/src/layouts/AppShell.vue

@@ -48,6 +48,7 @@
 <script setup lang="ts">
 import {
   AuditOutlined,
+  GlobalOutlined,
   SafetyCertificateOutlined,
   SettingOutlined,
   TeamOutlined,
@@ -72,6 +73,7 @@ const collapsed = ref(false);
 
 const menuLeaves: MenuLeaf[] = [
   { key: "/admin-users", label: "用户管理", path: "/admin-users" },
+  { key: "/site-domain-mappings", label: "站点映射", path: "/site-domain-mappings" },
   { key: "/accounts", label: "操作员管理", path: "/accounts" },
   { key: "/audits", label: "审计日志", path: "/audits" },
 ];
@@ -82,6 +84,11 @@ const menuItems = computed<ItemType[]>(() => [
     label: "用户管理",
     icon: () => h(TeamOutlined),
   },
+  {
+    key: "/site-domain-mappings",
+    label: "站点映射",
+    icon: () => h(GlobalOutlined),
+  },
   {
     key: "system",
     label: "系统设置",