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/testkit/src/tmdb/fixtures.ts

@@ -28,6 +28,8 @@ export interface TmdbFixture {
   /** 额外译名(titles 中的语言会自动生成 translations) */
   extra_translations?: { iso_639_1: string; iso_3166_1: string; title: string }[];
   seasons?: TmdbFixtureSeason[];
+  /** 海报路径(拼 image.tmdb.org);缺省 null */
+  poster_path?: string | null;
 }
 
 function eps(n: number, start: string, zh: (i: number) => string, en: (i: number) => string): TmdbFixtureEpisode[] {
@@ -55,6 +57,7 @@ export const TMDB_FIXTURES: TmdbFixture[] = [
       { iso_3166_1: "CN", title: "奥本海默传", type: "" },
     ],
     external_ids: { imdb_id: "tt15398776" },
+    poster_path: "/oppenheimer.jpg",
     extra_translations: [{ iso_639_1: "ja", iso_3166_1: "JP", title: "オッペンハイマー" }],
   },
   {

packages/testkit/src/tmdb/mock-tmdb.ts

@@ -41,6 +41,7 @@ export async function createMockTmdb(opts: MockTmdbOptions = {}): Promise<MockTm
           original_language: f.original_language,
           overview,
           popularity: f.popularity,
+          poster_path: f.poster_path ?? null,
         }
       : {
           id: f.id,
@@ -51,6 +52,7 @@ export async function createMockTmdb(opts: MockTmdbOptions = {}): Promise<MockTm
           origin_country: f.origin_country,
           overview,
           popularity: f.popularity,
+          poster_path: f.poster_path ?? null,
         };
   };