feat(api): carry poster and rating through search and lists

Widen the unified search so both §9.2 halves can render a thumbnail
and a rating: TMDB results gain vote_average/vote_count from the
search bodies, library results read the #145 artwork columns, and
episodes take their series' art. GET /api/movies and /api/series gain
the same two fields for the #151 grid. Mirrors in web updated.

web/src/library.ts

@@ -17,6 +17,10 @@ export interface LibrarySeries {
   auto_track: boolean;
   upstream_ended: boolean;
   blocked: boolean;
+  /** Stored artwork (§9.6) — a grid tile renders without a TMDB call. */
+  poster_path: string | null;
+  /** TMDB's rating, out of 10; `null` when TMDB has no votes for it. */
+  vote_average: number | null;
   status: SeriesStatus;
   wanted_episodes: number;
   available_episodes: number;

web/src/search.ts

@@ -15,6 +15,10 @@ export interface LibraryMovie {
   wanted: boolean;
   state: "missing" | "downloading" | "available";
   blocked: boolean;
+  /** Stored artwork (§9.6) — a row renders without a TMDB call. */
+  poster_path: string | null;
+  /** TMDB's rating, out of 10; `null` when TMDB has no votes for it. */
+  vote_average: number | null;
   /** The §5.7 rule relaxed to allow an import, when a file carries one. */
   waiver?: unknown;
 }
@@ -28,6 +32,8 @@ export interface LibrarySeriesHit {
   original_language: string | null;
   root_id: number;
   blocked: boolean;
+  poster_path: string | null;
+  vote_average: number | null;
 }
 
 export interface LibraryEpisodeHit {
@@ -39,6 +45,9 @@ export interface LibraryEpisodeHit {
   tag: string;
   /** The episode title — what the search matched on. */
   title: string;
+  /** The series' poster — an episode has no artwork of its own worth showing at row size. */
+  poster_path: string | null;
+  vote_average: number | null;
 }
 
 export type LibraryResult = LibraryMovie | LibrarySeriesHit | LibraryEpisodeHit;
@@ -51,6 +60,10 @@ export interface TmdbMovie {
   original_language: string;
   year: number | null;
   overview: string | null;
+  poster_path: string | null;
+  /** TMDB's rating, out of 10; `null` when TMDB has no votes for it. */
+  vote_average: number | null;
+  vote_count: number;
 }
 
 export interface TmdbSeries {
@@ -60,6 +73,9 @@ export interface TmdbSeries {
   original_language: string;
   year: number | null;
   overview: string | null;
+  poster_path: string | null;
+  vote_average: number | null;
+  vote_count: number;
 }
 
 export type TmdbResult = TmdbMovie | TmdbSeries;
@@ -142,6 +158,8 @@ export interface ApiSeries {
   overrides: Record<string, unknown>;
   upstream_ended: boolean;
   blocked: boolean;
+  poster_path: string | null;
+  vote_average: number | null;
   status: string;
   wanted_episodes: number;
   available_episodes: number;