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/supervisor/supervisor.controller.ts

@@ -0,0 +1,37 @@
+import { Controller, Get, Post, Body, Query, Logger } from '@nestjs/common';
+import { SupervisorService } from './supervisor.service';
+
+@Controller('api/supervisor')
+export class SupervisorController {
+    private readonly logger = new Logger(SupervisorController.name);
+
+    constructor(private readonly supervisor: SupervisorService) {}
+
+    @Get('active-calls')
+    getActiveCalls() {
+        return this.supervisor.getActiveCalls();
+    }
+
+    @Get('team-performance')
+    async getTeamPerformance(@Query('date') date?: string) {
+        const targetDate = date ?? new Date().toISOString().split('T')[0];
+        this.logger.log(`Team performance: date=${targetDate}`);
+        return this.supervisor.getTeamPerformance(targetDate);
+    }
+
+    @Post('call-event')
+    handleCallEvent(@Body() body: any) {
+        const event = body.data ?? body;
+        this.logger.log(`Call event: ${event.action} ucid=${event.ucid ?? event.monitorUCID} agent=${event.agent_id ?? event.agentID}`);
+        this.supervisor.handleCallEvent(event);
+        return { received: true };
+    }
+
+    @Post('agent-event')
+    handleAgentEvent(@Body() body: any) {
+        const event = body.data ?? body;
+        this.logger.log(`Agent event: ${event.action} agent=${event.agentId ?? event.agent_id}`);
+        this.supervisor.handleAgentEvent(event);
+        return { received: true };
+    }
+}