feat: transcription fix + SLA write-back + real-time supervisor events

- Deepgram: multichannel=true + language=multi (captures both speakers, multilingual)
- LLM speaker identification (agent vs customer from conversational cues)
- Removed summarize=v2 (incompatible with multilingual)
- SLA computation on call creation (lead.createdAt → call.startedAt elapsed %)
- WebSocket: supervisor room + call:created broadcast for real-time updates
- Maint: clear-analysis-cache endpoint + scanKeys/deleteCache on SessionService
- AI chat: rules-engine context routing with dedicated system prompt

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

src/maint/maint.module.ts

@@ -3,10 +3,11 @@ import { PlatformModule } from '../platform/platform.module';
 import { OzonetelAgentModule } from '../ozonetel/ozonetel-agent.module';
 import { AuthModule } from '../auth/auth.module';
 import { SupervisorModule } from '../supervisor/supervisor.module';
+import { CallerResolutionModule } from '../caller/caller-resolution.module';
 import { MaintController } from './maint.controller';
 
 @Module({
-    imports: [PlatformModule, OzonetelAgentModule, AuthModule, SupervisorModule],
+    imports: [PlatformModule, OzonetelAgentModule, AuthModule, SupervisorModule, CallerResolutionModule],
     controllers: [MaintController],
 })
 export class MaintModule {}