feat(config): add MosaicConfig schema + loader with tier auto-detection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/gateway/src/queue/queue.module.ts

@@ -1,5 +1,7 @@
 import { Global, Module } from '@nestjs/common';
 import { createQueueAdapter, type QueueAdapter } from '@mosaic/queue';
+import type { MosaicConfig } from '@mosaic/config';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
 import { QueueService } from './queue.service.js';
 
 export const QUEUE_ADAPTER = 'QUEUE_ADAPTER';
@@ -10,11 +12,8 @@ export const QUEUE_ADAPTER = 'QUEUE_ADAPTER';
     QueueService,
     {
       provide: QUEUE_ADAPTER,
-      useFactory: (): QueueAdapter =>
-        createQueueAdapter({
-          type: 'bullmq',
-          url: process.env['VALKEY_URL'],
-        }),
+      useFactory: (config: MosaicConfig): QueueAdapter => createQueueAdapter(config.queue),
+      inject: [MOSAIC_CONFIG],
     },
   ],
   exports: [QueueService, QUEUE_ADAPTER],