feat: SSE agent state, maint module, timestamp fix, missed call lead lookup

- SSE agent state stream: supervisor maintains state map from Ozonetel webhooks, streams via /api/supervisor/agent-state/stream
- Force-logout via SSE: distinct force-logout event type avoids conflict with normal login cycle
- Maint module (/api/maint): OTP-guarded endpoints for force-ready, unlock-agent, backfill-missed-calls, fix-timestamps
- Fix Ozonetel IST→UTC timestamp conversion: istToUtc() in webhook controller and missed-queue service
- Missed call lead lookup: ingestion queries leads by phone, stores leadId + leadName on Call entity
- Timestamp backfill endpoint: throttled at 700ms/mutation, idempotent (skips already-fixed records)
- Structured logging: full JSON payloads for agent/call webhooks, [DISPOSE] trace with agentId
- Fix dead code: agent-state endpoint auto-assign was after return statement
- Export SupervisorService for cross-module injection

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

src/worklist/missed-call-webhook.controller.ts

@@ -2,6 +2,16 @@ import { Controller, Post, Body, Headers, Logger } from '@nestjs/common';
 import { PlatformGraphqlService } from '../platform/platform-graphql.service';
 import { ConfigService } from '@nestjs/config';
 
+// Ozonetel sends all timestamps in IST — convert to UTC for storage
+function istToUtc(istDateStr: string | null): string | null {
+    if (!istDateStr) return null;
+    // Parse as-is, then subtract 5:30 to get UTC
+    const d = new Date(istDateStr);
+    if (isNaN(d.getTime())) return null;
+    d.setMinutes(d.getMinutes() - 330); // IST is UTC+5:30
+    return d.toISOString();
+}
+
 @Controller('webhooks/ozonetel')
 export class MissedCallWebhookController {
     private readonly logger = new Logger(MissedCallWebhookController.name);
@@ -130,8 +140,8 @@ export class MissedCallWebhookController {
             callStatus: data.callStatus,
             callerNumber: { primaryPhoneNumber: `+91${data.callerPhone}` },
             agentName: data.agentName,
-            startedAt: data.startTime ? new Date(data.startTime).toISOString() : null,
-            endedAt: data.endTime ? new Date(data.endTime).toISOString() : null,
+            startedAt: istToUtc(data.startTime),
+            endedAt: istToUtc(data.endTime),
             durationSec: data.duration,
             disposition: this.mapDisposition(data.disposition),
         };