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/services/request-creator.service.ts

@@ -84,6 +84,7 @@ export async function createRequestForUser(
   let year: number | undefined;
   let series: string | undefined;
   let seriesPart: string | undefined;
+  let seriesAsin: string | undefined;
   try {
     const audibleService = getAudibleService();
     const audnexusData = await audibleService.getAudiobookDetails(audiobook.asin);
@@ -100,6 +101,7 @@ export async function createRequestForUser(
     }
     if (audnexusData?.series) series = audnexusData.series;
     if (audnexusData?.seriesPart) seriesPart = audnexusData.seriesPart;
+    if (audnexusData?.seriesAsin) seriesAsin = audnexusData.seriesAsin;
   } catch (error) {
     logger.warn(`Failed to fetch Audnexus data for ASIN ${audiobook.asin}: ${error instanceof Error ? error.message : 'Unknown error'}`);
   }
@@ -121,6 +123,7 @@ export async function createRequestForUser(
         year,
         series,
         seriesPart,
+        seriesAsin,
         status: 'requested',
       },
     });
@@ -134,6 +137,7 @@ export async function createRequestForUser(
     if (year) updates.year = year;
     if (series) updates.series = series;
     if (seriesPart) updates.seriesPart = seriesPart;
+    if (seriesAsin) updates.seriesAsin = seriesAsin;
 
     if (Object.keys(updates).length > 0) {
       audiobookRecord = await prisma.audiobook.update({