feat(performance-alerts): rules-engine-driven alerts, persisted as PerformanceAlert

Phase A+B of the alerts overhaul:

- New PerformanceFactsProvider exposes agent.idleMinutes (from
  AgentSession), agent.busyMinutes, agent.totalCallsToday,
  agent.bookedCallsToday, agent.conversionPercent
- Implement EscalateActionHandler (was a stub): persists a
  PerformanceAlert row, dedupes per agent+type+IST date so a 5-min
  cron can't spam, updates value if it changes
- New PerformanceConsumer: setInterval every 5 min, reads on_schedule
  rules referencing agent.* facts, evaluates per agent, dispatches
  escalate actions
- Two starter rules in hospital-starter.json: excessive-idle (>60min)
  and low-conversion (<15% with >10 calls today). NPS deferred — no
  source signal exists yet
- New PerformanceAlertsController: GET /api/supervisor/performance-alerts
  (active list), POST /:id/dismiss, POST /dismiss-all
- Rules engine now injects EscalateActionHandler via DI so the action
  has access to PlatformGraphqlService for persistence

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

src/supervisor/supervisor.module.ts

@@ -3,6 +3,7 @@ import { PlatformModule } from '../platform/platform.module';
 import { OzonetelAgentModule } from '../ozonetel/ozonetel-agent.module';
 import { SupervisorController } from './supervisor.controller';
 import { SupervisorBargeController } from './supervisor-barge.controller';
+import { PerformanceAlertsController } from './performance-alerts.controller';
 import { SupervisorService } from './supervisor.service';
 import { AgentHistoryService } from './agent-history.service';
 import { OzonetelAdminAuthService } from '../ozonetel/ozonetel-admin-auth.service';
@@ -12,7 +13,7 @@ import { OzonetelAdminAuthService } from '../ozonetel/ozonetel-admin-auth.servic
 // — it causes a circular dependency via AuthModule.
 @Module({
     imports: [PlatformModule, forwardRef(() => OzonetelAgentModule)],
-    controllers: [SupervisorController, SupervisorBargeController],
+    controllers: [SupervisorController, SupervisorBargeController, PerformanceAlertsController],
     providers: [SupervisorService, AgentHistoryService, OzonetelAdminAuthService],
     exports: [SupervisorService, AgentHistoryService, OzonetelAdminAuthService],
 })