feat(core): notification inbox infinite scroll + command palette fix (+ pending WIP)

消息中心:全量渲染 → 真·后端分页滚动加载
- backend(ops/views): NotificationPagination(10/页,page_size 可覆盖)+
  响应回 type_counts(按收件人绝对计数,不受分页/搜索影响)
- frontend(messages): 自管分页,滚到底加载下一批;tab/搜索走服务端并重置到第1页;
  代号作废在途旧请求防切换卡空白;乐观标已读;「已加载 X / Y」分母用当前筛选总数
- api/App/types: listNotifications 支持 page/page_size/search;allNotifications 携带 type_counts

命令面板(侧边栏搜索):修复点开后 UI 错位
- app-shell: 遮罩 className 漏了基类 shell-command-bg(只有 .show)致无定位塌到左下;
  补回基类 + header 类名对齐 .shell-command-h
- messages-page.css: 工作台收进视口高度,收件箱在面板内滚动

本次提交一并带入此前若干未提交 WIP(account/ai-tools/library/pipeline/products/settings +
accounts/ai/assets/billing/projects 后端),按用户要求整体推 dev。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/App.tsx

@@ -107,23 +107,23 @@ export function App() {
       await Promise.all([
         api.products(),
         api.projects(),
-        api.assets(),
+        api.allAssets(),
         api.billingSummary().catch(() => null),
-        api.ledgers().catch(() => []),
+        api.ledgers(1, 10).catch(() => ({ count: 0, page: 1, page_size: 10, results: [] as Ledger[] })),
         api.billingTrend().catch(() => null),
         api.teamMembers().catch(() => []),
         api.modelConfigs().catch(() => null),
         api.aiTasks().catch(() => null),
-        api.listNotifications().catch(() => null)
+        api.allNotifications().catch(() => null)
       ]);
     setProducts(productData.results);
     setProjects(projectData.results);
-    setAssets(assetData.results);
+    setAssets(assetData);
     setTeamMembers(memberData);
     setModelConfigs(modelData?.results || []);
     setAiTasks(taskData?.results || []);
     if (billingData) setBilling(billingData);
-    setLedgers(ledgerData);
+    setLedgers(ledgerData.results);
     setBillingTrend(trendData);
     if (notificationData) {
       setNotifications(notificationData.results);
@@ -161,7 +161,7 @@ export function App() {
   }
 
   const reloadNotifications = useCallback(async () => {
-    const data = await api.listNotifications().catch(() => null);
+    const data = await api.allNotifications().catch(() => null);
     if (data) {
       setNotifications(data.results);
       setUnreadCount(data.unread_count);
@@ -513,7 +513,6 @@ export function App() {
       case "messages":
         return (
           <MessagesPage
-            notifications={notifications}
             unreadCount={unreadCount}
             onMarkRead={markNotificationRead}
             onMarkAllRead={markAllNotificationsRead}
@@ -521,7 +520,7 @@ export function App() {
           />
         );
       case "assetFactory":
-        return <AssetFactoryPage navigate={navigate} aiTasks={aiTasks} />;
+        return <AssetFactoryPage navigate={navigate} aiTasks={aiTasks} assets={assets} />;
       case "imageOptimize":
         return <ImageWorkbenchPage mode="image" products={products} assets={assets} modelConfigs={modelConfigs} onBack={() => navigate("assetFactory")} navigate={navigate} onGenerate={generateImages} />;
       case "modelPhoto":