Add series browsing, search, and detail UI

Introduce full support for Audible series exploration: API routes, frontend pages, components, hooks, and integrations. Key changes:

- Prisma: add Audiobook.seriesAsin for linking audiobooks to series detail pages.
- Backend: add /api/series/search and /api/series/[asin] routes that require auth; scrape Audible series data and enrich books with library availability.
- Integrations/services: add audible-series integration and update request/HTTP services to support the workflow.
- Frontend: add /series and /series/[asin] pages, new components (SeriesCard, SeriesGrid, SeriesDetailCard, SimilarSeriesRow) and wire them to a new useSeries hook; update AudiobookDetailsModal to show/link series; add Series link to Header.
- Misc: extend audiobook types with series fields and add seriesLabels to language-config for scraping.

These changes enable users to search for series, view series metadata and books, and navigate between audiobook and series detail pages.

src/lib/integrations/audible.service.ts

@@ -48,6 +48,7 @@ export interface AudibleAudiobook {
   genres?: string[];
   series?: string;
   seriesPart?: string;
+  seriesAsin?: string;
 }
 
 export interface AudibleSearchResult {
@@ -77,6 +78,22 @@ export class AudibleService {
     return this.baseUrl;
   }
 
+  /**
+   * Get the current Audible region code
+   */
+  public getRegion(): AudibleRegion {
+    return this.region;
+  }
+
+  /**
+   * Public fetch wrapper for external scraping modules (e.g. audible-series.ts).
+   * Ensures the service is initialized and delegates to fetchWithRetry.
+   */
+  public async fetch(url: string, config: any = {}): Promise<{ data: any; meta: FetchResultMeta }> {
+    await this.initialize();
+    return this.fetchWithRetry(url, config);
+  }
+
   /**
    * Get the language config for the current region
    */
@@ -749,6 +766,7 @@ export class AudibleService {
         genres: data.genres?.map((g: any) => typeof g === 'string' ? g : g.name).slice(0, 5) || undefined,
         series: data.seriesPrimary?.name || undefined,
         seriesPart: data.seriesPrimary?.position || undefined,
+        seriesAsin: data.seriesPrimary?.asin || undefined,
       };
 
       // Ensure cover art URL is high quality
@@ -765,7 +783,8 @@ export class AudibleService {
         rating: result.rating,
         genreCount: result.genres?.length || 0,
         series: result.series,
-        seriesPart: result.seriesPart
+        seriesPart: result.seriesPart,
+        seriesAsin: result.seriesAsin
       });
 
       return result;