chore(deploy): add same-host staging stack next to production

dev deploys to /opt/dukang-staging (819x, *-test domains); main deploys to production. Staging uses full Mock with shared WeChat app ids.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/admin-web/src/layouts/AdminLayout.tsx

@@ -204,6 +204,8 @@ function filterMenuItems(items: MenuProps['items'], permissionKeys: string[]): M
     .filter(Boolean) as MenuProps['items'];
 }
 
+const IS_STAGING = import.meta.env.VITE_APP_ENV === 'staging';
+
 export default function AdminLayout() {
   const navigate = useNavigate();
   const location = useLocation();
@@ -239,16 +241,35 @@ export default function AdminLayout() {
 
   return (
     <Layout style={{ height: '100vh', overflow: 'hidden' }}>
+      {IS_STAGING ? (
+        <div
+          style={{
+            position: 'fixed',
+            top: 0,
+            left: 0,
+            right: 0,
+            zIndex: 1100,
+            background: '#d48806',
+            color: '#fff',
+            textAlign: 'center',
+            fontSize: 13,
+            fontWeight: 600,
+            lineHeight: '28px',
+          }}
+        >
+          测试环境 · staging · 数据与生产隔离 · Mock 开启
+        </div>
+      ) : null}
       <Sider
         breakpoint="lg"
         collapsedWidth={64}
         theme="dark"
         width={220}
-        style={{ height: '100vh', overflow: 'hidden' }}
+        style={{ height: '100vh', overflow: 'hidden', marginTop: IS_STAGING ? 28 : 0 }}
       >
-        <div style={{ display: 'flex', flexDirection: 'column', height: '100vh' }}>
+        <div style={{ display: 'flex', flexDirection: 'column', height: IS_STAGING ? 'calc(100vh - 28px)' : '100vh' }}>
           <div style={{ flexShrink: 0, padding: '16px', color: '#fff', fontWeight: 600 }}>
-            杜康 HQ
+            杜康 HQ{IS_STAGING ? ' · 测试' : ''}
           </div>
           <div className="admin-sider-menu-scroll" style={{ flex: 1, minHeight: 0, overflow: 'auto' }}>
             <Menu
@@ -264,7 +285,15 @@ export default function AdminLayout() {
           </div>
         </div>
       </Sider>
-      <Layout style={{ height: '100vh', overflow: 'hidden', display: 'flex', flexDirection: 'column' }}>
+      <Layout
+        style={{
+          height: IS_STAGING ? 'calc(100vh - 28px)' : '100vh',
+          marginTop: IS_STAGING ? 28 : 0,
+          overflow: 'hidden',
+          display: 'flex',
+          flexDirection: 'column',
+        }}
+      >
         <Header
           style={{
             flexShrink: 0,