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.

prisma/migrations/20260303000000_add_works_table/migration.sql

@@ -0,0 +1,42 @@
+-- CreateTable
+CREATE TABLE "works" (
+    "id" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "author" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "works_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "work_asins" (
+    "id" TEXT NOT NULL,
+    "work_id" TEXT NOT NULL,
+    "asin" TEXT NOT NULL,
+    "narrator" TEXT,
+    "duration_minutes" INTEGER,
+    "is_canonical" BOOLEAN NOT NULL DEFAULT false,
+    "source" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "work_asins_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "works_title_idx" ON "works"("title");
+
+-- CreateIndex
+CREATE INDEX "works_author_idx" ON "works"("author");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "work_asins_asin_key" ON "work_asins"("asin");
+
+-- CreateIndex
+CREATE INDEX "work_asins_work_id_idx" ON "work_asins"("work_id");
+
+-- CreateIndex
+CREATE INDEX "work_asins_asin_idx" ON "work_asins"("asin");
+
+-- AddForeignKey
+ALTER TABLE "work_asins" ADD CONSTRAINT "work_asins_work_id_fkey" FOREIGN KEY ("work_id") REFERENCES "works"("id") ON DELETE CASCADE ON UPDATE CASCADE;