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/server/src/modules/acquisition-organize/routes/library.ts

@@ -510,9 +510,9 @@ export function registerLibraryRoutes(app: ModuleApp, d: AoDeps) {
               observedAt: new Date().toISOString(),
             },
       );
-      // partial:至少一个实例因查询失败/超时为 unknown(no_external_id 不算失败)。契约未列此字段,前端可按需读取
+      // partial:至少一个实例因查询失败/超时为 unknown(no_external_id 不算失败)
       const partial = instances.some((x) => x.status === "unknown" && x.reason !== "no_external_id");
-      return { mediaEntityId: e!.id, instances, partial } as MediaServerInventory;
+      return { mediaEntityId: e!.id, instances, partial } satisfies MediaServerInventory;
     },
     { tag: TAG },
   );