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/kookoo-ivr.controller.ts

@@ -0,0 +1,49 @@
+import { Controller, Get, Query, Logger, Header } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+@Controller('kookoo')
+export class KookooIvrController {
+    private readonly logger = new Logger(KookooIvrController.name);
+    private readonly sipId: string;
+
+    constructor(private config: ConfigService) {
+        this.sipId = process.env.OZONETEL_SIP_ID ?? '523590';
+    }
+
+    @Get('ivr')
+    @Header('Content-Type', 'application/xml')
+    handleIvr(@Query() query: Record<string, any>): string {
+        const event = query.event ?? '';
+        const sid = query.sid ?? '';
+        const cid = query.cid ?? '';
+        const data = query.data ?? '';
+        const status = query.status ?? '';
+
+        this.logger.log(`Kookoo IVR: event=${event} sid=${sid} cid=${cid} status=${status}`);
+
+        // New outbound call — customer answered, connect to agent's SIP
+        if (event === 'NewCall') {
+            this.logger.log(`Connecting customer ${cid} to agent SIP ${this.sipId}`);
+            return `<?xml version="1.0" encoding="UTF-8"?>
+<response>
+<dial record="true" timeout="30" moh="ring">${this.sipId}</dial>
+</response>`;
+        }
+
+        // Dial event — call to agent finished
+        if (event === 'Dial') {
+            this.logger.log(`Dial completed: status=${status} data=${data}`);
+            return `<?xml version="1.0" encoding="UTF-8"?>
+<response>
+<hangup/>
+</response>`;
+        }
+
+        // Hangup or any other event
+        this.logger.log(`Call ended: event=${event}`);
+        return `<?xml version="1.0" encoding="UTF-8"?>
+<response>
+<hangup/>
+</response>`;
+    }
+}