perf(enrich): параллельная обработка очереди (3 трека) — быстрее покрывать живой набор

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/enrich/enrichment.service.ts

@@ -17,7 +17,8 @@ export class EnrichmentService {
   // Очередь обогащения с троттлингом (под лимиты Discogs/iTunes)
   private readonly queue: string[] = [];
   private running = false;
-  private readonly throttleMs = 1500;
+  private readonly throttleMs = 1000;
+  private readonly concurrency = 3;
 
   constructor(
     private readonly prisma: PrismaService,
@@ -94,9 +95,8 @@ export class EnrichmentService {
     this.running = true;
     try {
       while (this.queue.length > 0) {
-        const id = this.queue.shift();
-        if (!id) continue;
-        await this.enrichOne(id);
+        const batch = this.queue.splice(0, this.concurrency);
+        await Promise.all(batch.map((id) => this.enrichOne(id)));
         await this.sleep(this.throttleMs);
       }
     } finally {