Add works table and ASIN deduping

Add persistent cross-ASIN "works" mapping and client-side deduplication to improve library matching. Introduces a Prisma migration and models (Work, WorkAsin) plus src/lib/services/works.service for persisting dedup groups, seeding ASINs at request time, and sibling lookup. Adds a deduplication utility (deduplicate-audiobooks) that normalizes titles/narrators, compares durations, and returns grouping metadata; API routes (search, author, series) now deduplicate results before enrichment and fire-and-forget persist groups. Adds sibling-ASIN expansion into audiobook matcher and expands getAvailableAsins accordingly. Extracts runtime parsing into a shared parse-runtime util and updates audible scrapers/services to use it. Includes unit tests for dedup logic and works service and updates test Prisma mocks.

src/app/api/series/[asin]/route.ts

@@ -8,6 +8,8 @@ import { getCurrentUser } from '@/lib/middleware/auth';
 import { RMABLogger } from '@/lib/utils/logger';
 import { scrapeSeriesPage } from '@/lib/integrations/audible-series';
 import { enrichAudiobooksWithMatches } from '@/lib/utils/audiobook-matcher';
+import { deduplicateAndCollectGroups } from '@/lib/utils/deduplicate-audiobooks';
+import { persistDedupGroups } from '@/lib/services/works.service';
 
 const logger = RMABLogger.create('API.Series.Detail');
 
@@ -49,9 +51,17 @@ export async function GET(
       );
     }
 
+    // Deduplicate before enrichment to avoid wasted DB queries on duplicate entries
+    const { books: dedupedBooks, groups } = deduplicateAndCollectGroups(detail.books);
+
+    // Fire-and-forget: persist dedup groups to works table for cross-ASIN matching
+    if (groups.length > 0) {
+      persistDedupGroups(groups).catch(() => {});
+    }
+
     // Enrich books with library availability and request status
     const userId = currentUser.sub || undefined;
-    const enrichedBooks = await enrichAudiobooksWithMatches(detail.books, userId);
+    const enrichedBooks = await enrichAudiobooksWithMatches(dedupedBooks, userId);
 
     logger.info(`Series detail complete: "${detail.title}" (${enrichedBooks.length} books, page ${page})`);