refactor: 前端架构重构 — hook拆分、组件拆分、类型筛选器动态化、Meta API

- 后端新增 GET /api/meta 端点（checkerRegistry.supportedTypes）及 MetaResponse 类型
- 前端 hook 拆分为 use-queries.ts（全局查询+useMeta）和 use-target-detail.ts（Drawer状态）
- TargetDetailDrawer 拆分为 OverviewTab + HistoryTab + history-table-columns + stats.ts
- 类型筛选器由 meta API 动态驱动，删除 target-type-display 静态映射
- 列定义改为工厂函数 createTargetTableColumns(checkerTypes)，TargetGroup 新增 columns prop
- 修复 StatusDonut key、StatusBar maxSlots prop、TrendChart 移除 loading prop
- 补充 utils/time、utils/stats、动态列工厂测试，删除旧 mapping 测试
- 同步 delta specs 到主 specs，归档 frontend-architecture-refactor change

src/web/hooks/use-queries.ts

@@ -0,0 +1,41 @@
+import { useQuery } from "@tanstack/react-query";
+
+import type { MetaResponse, SummaryResponse, TargetStatus } from "../../shared/api";
+
+const queryKeys = {
+  meta: () => ["meta"] as const,
+  summary: () => ["summary"] as const,
+  targets: () => ["targets"] as const,
+};
+
+export async function fetchJson<T>(url: string): Promise<T> {
+  const response = await fetch(url);
+  if (!response.ok) throw new Error(`HTTP ${response.status}`);
+  return response.json() as Promise<T>;
+}
+
+export function useMeta() {
+  return useQuery({
+    queryFn: () => fetchJson<MetaResponse>("/api/meta"),
+    queryKey: queryKeys.meta(),
+    staleTime: Infinity,
+  });
+}
+
+export function useSummary() {
+  return useQuery({
+    queryFn: () => fetchJson<SummaryResponse>("/api/summary"),
+    queryKey: queryKeys.summary(),
+    refetchInterval: 8000,
+    refetchIntervalInBackground: false,
+  });
+}
+
+export function useTargets() {
+  return useQuery({
+    queryFn: () => fetchJson<TargetStatus[]>("/api/targets"),
+    queryKey: queryKeys.targets(),
+    refetchInterval: 8000,
+    refetchIntervalInBackground: false,
+  });
+}