feat: add marketplace metrics, privacy features, and service registry endpoints

- Add Prometheus metrics for marketplace API throughput and error rates with new dashboard panels
- Implement confidential transaction models with encryption support and access control
- Add key management system with registration, rotation, and audit logging
- Create services and registry routers for service discovery and management
- Integrate ZK proof generation for privacy-preserving receipts
- Add metrics instru

infra/helm/charts/coordinator/Chart.yaml

@@ -0,0 +1,11 @@
+apiVersion: v2
+name: aitbc-coordinator
+description: AITBC Coordinator API Helm Chart
+type: application
+version: 0.1.0
+appVersion: "0.1.0"
+dependencies:
+  - name: postgresql
+    version: 12.x.x
+    repository: https://charts.bitnami.com/bitnami
+    condition: postgresql.enabled