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]>

packages/adapters/src/tmdb/client.ts

@@ -57,6 +57,8 @@ export interface MetadataCandidate {
   originCountry: string[];
   popularity: number | null;
   overview: string | null;
+  /** TMDB poster_path(如 `/abc.jpg`),拼图片 CDN 用;没有为 null */
+  posterPath: string | null;
   seasons?: CandidateSeason[];
   externalIds?: { imdb?: string; tvdb?: string };
   /** 是否已拉过详情(别名/季信息只在详情中完整) */
@@ -266,6 +268,7 @@ export class TmdbClient {
       originCountry: Array.isArray(r.origin_country) ? (r.origin_country as string[]) : [],
       popularity: n(r.popularity),
       overview: s(r.overview),
+      posterPath: s(r.poster_path),
       detailed: false,
     };
   }