Implement file hash-based library matching and remove fuzzy ASIN matching

Adds file hash-based matching for Audiobookshelf library items to ensure 100% accurate ASIN assignment for RMAB-organized content. Removes fuzzy matching from library availability checks, making all matching ASIN-only to eliminate false positives and race conditions. Updates database schema, processors, and matcher utilities; adds new tests and documentation for the new matching strategy. Removes obsolete scripts, Dockerfile, and related tests; updates docker-compose for test environments.

prisma/migrations/20260122100000_remove_deprecated_bookdate_fields/migration.sql

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+-- AlterTable
+-- Remove deprecated fields from bookdate_config table
+-- These fields have been migrated to per-user settings (User.bookDateLibraryScope and User.bookDateCustomPrompt)
+ALTER TABLE "bookdate_config" DROP COLUMN IF EXISTS "library_scope";
+ALTER TABLE "bookdate_config" DROP COLUMN IF EXISTS "custom_prompt";

prisma/migrations/20260126000000_add_indexer_id_to_download_history/migration.sql

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+-- AlterTable
+ALTER TABLE "download_history" ADD COLUMN "indexer_id" INTEGER;
+
+-- CreateIndex
+CREATE INDEX "download_history_indexer_id_idx" ON "download_history"("indexer_id");

prisma/migrations/20260126100000_add_audiobook_files_hash/migration.sql

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+-- Add files_hash field to audiobooks table for accurate library matching
+-- SHA256 hash of sorted audio filenames used to match RMAB-organized content with ABS library items
+
+-- AlterTable
+ALTER TABLE "audiobooks" ADD COLUMN "files_hash" TEXT;
+
+-- CreateIndex
+CREATE INDEX "audiobooks_files_hash_idx" ON "audiobooks"("files_hash");