feat: switch to global_healthx Ozonetel account, add Dockerfile

- Update default campaign to Inbound_918041763265
- Add Dockerfile and .dockerignore for container deployment
- Sidecar image: 043728036361.dkr.ecr.ap-south-1.amazonaws.com/fortytwo-eap/helix-engage-sidecar:alpha

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

src/ozonetel/ozonetel-agent.service.ts

@@ -82,7 +82,7 @@ export class OzonetelAgentService {
                     customer: this.accountId,
                     agentId: params.agentId,
                     custNumber: params.customerNumber,
-                    campaignName: params.campaignName ?? 'Inbound_918062873123',
+                    campaignName: params.campaignName ?? 'Inbound_918041763265',
                     timestamp: Date.now(),
                 },
                 {