feat: supervisor module — team performance + active calls endpoints

- SupervisorService: aggregates Ozonetel agent summary across all agents,
  tracks active calls from real-time events
- GET /api/supervisor/team-performance — per-agent time breakdown + thresholds
- GET /api/supervisor/active-calls — current active call map
- POST /api/supervisor/call-event — Ozonetel event webhook
- POST /api/supervisor/agent-event — Ozonetel agent event webhook

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app.module.ts

@@ -12,6 +12,7 @@ import { HealthModule } from './health/health.module';
 import { WorklistModule } from './worklist/worklist.module';
 import { CallAssistModule } from './call-assist/call-assist.module';
 import { SearchModule } from './search/search.module';
+import { SupervisorModule } from './supervisor/supervisor.module';
 
 @Module({
     imports: [
@@ -30,6 +31,7 @@ import { SearchModule } from './search/search.module';
         WorklistModule,
         CallAssistModule,
         SearchModule,
+        SupervisorModule,
     ],
 })
 export class AppModule {}