feat(web): W3-3 site workbench, sources/feeds/snapshots, downloads with business timeline, organization records and agent sessions

- sites + /sites/:siteId: organized view with snapshot-first release list, inventory overlay,
  candidate reasons, volatile-field recheck, stale marking that keeps existing data, live search,
  unified download entry; origin view placeholder (M2)
- sources: feed CRUD/enable/fetch/reset, cursor/health/gap hints; per-site snapshot history
- tasks: download tasks with pause/resume (threshold pause cannot be bypassed), plans,
  cache volume thresholds and cleanup, business timeline (observation → plan → download →
  organization → agent/engine)
- organize: record list/detail with file-level results, manual organize with dryRun preview
- agent: session list/page and layout drawer with context prefix; streaming events,
  tool cards, rejection alerts, compaction, budget meters, model text vs server report;
  mock switch (?mock=1) until W2-D endpoints land

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/api/releases.ts

@@ -0,0 +1,79 @@
+import { keepPreviousData, useInfiniteQuery, useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { AcquisitionPlan, type ResolutionStatus, WorkbenchReleaseDetail, WorkbenchReleasePage } from "@umt/contracts";
+import { apiMutate, apiParsed, cleanParams } from "./parse.ts";
+
+// 站点工作台整理视图(W2-B:/sites/{id}/releases、/sites/{id}/releases/{rid})
+
+export type ReleaseFilters = {
+  q?: string;
+  category?: string;
+  promotion?: string;
+  resolution?: ResolutionStatus;
+};
+
+export const releaseKeys = {
+  all: ["releases"] as const,
+  list: (siteId: string, f: ReleaseFilters, live: boolean) => ["releases", "list", siteId, f, live] as const,
+  detail: (siteId: string, rid: string) => ["releases", "detail", siteId, rid] as const,
+};
+
+/**
+ * 统一资源列表,游标分页。live=true 强制实时补查(只对第一页);否则让服务端按"本地无结果或快照过期"自行决定。
+ * 翻页时保留上一次数据,避免"提取失败 = 空列表"。
+ */
+export function useSiteReleases(siteId: string | undefined, filters: ReleaseFilters, live = false) {
+  return useInfiniteQuery({
+    queryKey: releaseKeys.list(siteId ?? "", filters, live),
+    enabled: !!siteId,
+    initialPageParam: undefined as string | undefined,
+    placeholderData: keepPreviousData,
+    queryFn: ({ pageParam, signal }) =>
+      apiParsed(WorkbenchReleasePage, "/api/v1/sites/:id/releases", {
+        pathParams: { id: siteId ?? "" },
+        params: cleanParams({
+          ...filters,
+          cursor: pageParam,
+          limit: 50,
+          live: live && !pageParam ? "true" : undefined,
+        }),
+        signal,
+      }),
+    getNextPageParam: (last) => last.nextCursor ?? undefined,
+  });
+}
+
+/** 资源详情;refresh=true 时实时复核(失败保留既有数据并带 refreshError) */
+export function useReleaseDetail(siteId: string | undefined, rid: string | undefined) {
+  return useQuery({
+    queryKey: releaseKeys.detail(siteId ?? "", rid ?? ""),
+    enabled: !!siteId && !!rid,
+    queryFn: ({ signal }) =>
+      apiParsed(WorkbenchReleaseDetail, "/api/v1/sites/:id/releases/:rid", {
+        pathParams: { id: siteId ?? "", rid: rid ?? "" },
+        signal,
+      }),
+  });
+}
+
+export function useRefreshReleaseDetail() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: ({ siteId, rid }: { siteId: string; rid: string }) =>
+      apiParsed(WorkbenchReleaseDetail, "/api/v1/sites/:id/releases/:rid", {
+        pathParams: { id: siteId, rid },
+        params: { refresh: "true" },
+      }),
+    onSuccess: (d, v) => qc.setQueryData(releaseKeys.detail(v.siteId, v.rid), d),
+  });
+}
+
+/**
+ * 统一下载入口:与自动收录同一条提交流程(计划 → 去重 → 缓存硬阈值 → 实例选择 → 管理标签)。
+ * 后端对应端点 POST /acquisition-plans(sourceReleaseId + 可选 slotId);未提供时返回 not_found,页面给出说明。
+ */
+export function useSubmitRelease() {
+  return useMutation({
+    mutationFn: (body: { sourceReleaseId: string; slotId?: string; note?: string }) =>
+      apiMutate("/api/v1/acquisition-plans", { body }).then((d) => AcquisitionPlan.parse(d)),
+  });
+}