feat(contracts,server,web): files G6–G8 fields and identify S-7 contract

- G6: FileRoot.pendingCount/pendingPartial for download roots (same rule as the
  unidentified filter, recursive, cached 5 min, invalidated by files.changed)
- G7: FileEntry.parsedHint from parseReleasePath (file + parent dirs); the web
  subline uses it and no longer parses names itself
- G8: FileIdentifyCandidate.posterUrl (TMDB poster_path via adapter and
  catalog.lookup, local entities from metadata.posterPath); thumbnails in the
  identify panel
- S-7 contract: FilesIdentifyResult.remoteTaskId/remotePending,
  MediaServerInventory.partial, EventType identify.completed with
  IdentifyCompletedPayload; identify panel (useIdentifyLive) and organize wizard
  merge remote results by root + path, buffering events that beat the response

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

apps/web/app/components/files/use-identify-live.ts

@@ -0,0 +1,29 @@
+import { EventType } from "@umt/contracts";
+import { useEffect, useRef, useState } from "react";
+import { type FilesIdentifyResult, type IdentifyCompletedPayload, useIdentify } from "~/api/files.ts";
+import { useSse } from "~/lib/sse.ts";
+import { applyIdentifyCompleted } from "./model.ts";
+
+/**
+ * useIdentify + 远端结果回填(S-7):响应带 remoteTaskId 时,用 SSE identify.completed 里同一 taskId 的完整结果
+ * 按 root + path 替换条目。事件可能比 HTTP 响应先到,所以挂载期间一直订阅,并缓存最近几条。
+ * data 是回填后的结果;remotePending 表示还在等远端。
+ */
+export function useIdentifyLive() {
+  const m = useIdentify();
+  const [data, setData] = useState<FilesIdentifyResult | undefined>(undefined);
+  const early = useRef(new Map<string, IdentifyCompletedPayload>());
+  useEffect(() => {
+    const d = m.data;
+    const hit = d?.remoteTaskId ? early.current.get(d.remoteTaskId) : undefined;
+    setData(d && hit ? applyIdentifyCompleted(d, hit) : d);
+  }, [m.data]);
+  useSse([EventType.identifyCompleted], (ev) => {
+    if (ev.type !== EventType.identifyCompleted) return;
+    const p = ev.payload as IdentifyCompletedPayload;
+    early.current.set(p.taskId, p);
+    if (early.current.size > 20) early.current.delete(early.current.keys().next().value as string);
+    setData((d) => (d ? applyIdentifyCompleted(d, p) : d));
+  });
+  return { ...m, data, remotePending: !!data?.remoteTaskId };
+}