feat: Kookoo IVR endpoint — outbound calls now bridge to agent SIP

When customer answers outbound call, Kookoo hits /kookoo/ivr which
returns <dial record="true">523590</dial> to bridge the call to
the agent's SIP extension. Agent's browser rings, both connect.

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

src/ozonetel/ozonetel-agent.module.ts

@@ -1,9 +1,10 @@
 import { Module } from '@nestjs/common';
 import { OzonetelAgentController } from './ozonetel-agent.controller';
 import { OzonetelAgentService } from './ozonetel-agent.service';
+import { KookooIvrController } from './kookoo-ivr.controller';
 
 @Module({
-    controllers: [OzonetelAgentController],
+    controllers: [OzonetelAgentController, KookooIvrController],
     providers: [OzonetelAgentService],
     exports: [OzonetelAgentService],
 })