feat(#165): Implement BullMQ module setup

Create BullMQ module that shares the existing Valkey connection for job queue processing.

Files Created:
- apps/api/src/bullmq/bullmq.module.ts - Global module configuration
- apps/api/src/bullmq/bullmq.service.ts - Queue management service
- apps/api/src/bullmq/queues.ts - Queue name constants
- apps/api/src/bullmq/index.ts - Barrel exports
- apps/api/src/bullmq/bullmq.service.spec.ts - Unit tests

Files Modified:
- apps/api/src/app.module.ts - Import BullMqModule

Queue Definitions:
- mosaic-jobs (main queue)
- mosaic-jobs-runner (read-only operations)
- mosaic-jobs-weaver (write operations)
- mosaic-jobs-inspector (validation operations)

Implementation:
- Reuses VALKEY_URL from environment (shared connection)
- Follows existing Valkey module patterns
- Includes health check methods
- Proper lifecycle management (init/destroy)
- Queue names use hyphens instead of colons (BullMQ requirement)

Quality Gates:
- Unit tests: 11 passing
- TypeScript: No errors
- ESLint: No violations
- Build: Successful

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/bullmq/bullmq.module.ts

@@ -0,0 +1,23 @@
+import { Module, Global } from "@nestjs/common";
+import { BullMqService } from "./bullmq.service";
+
+/**
+ * BullMqModule - Job queue module using BullMQ with Valkey backend
+ *
+ * This module provides job queue functionality for the Mosaic Component Architecture.
+ * It creates and manages queues for different agent profiles:
+ * - mosaic-jobs (main queue)
+ * - mosaic-jobs-runner (read-only operations)
+ * - mosaic-jobs-weaver (write operations)
+ * - mosaic-jobs-inspector (validation operations)
+ *
+ * Shares the same Valkey connection used by ValkeyService (VALKEY_URL env var).
+ *
+ * Marked as @Global to allow injection across the application without explicit imports.
+ */
+@Global()
+@Module({
+  providers: [BullMqService],
+  exports: [BullMqService],
+})
+export class BullMqModule {}