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

enterprise-connectors/python-sdk/aitbc_enterprise/erp/__init__.py

@@ -0,0 +1,18 @@
+"""
+ERP system connectors for AITBC Enterprise
+"""
+
+from .base import ERPConnector, ERPDataModel, ProtocolHandler, DataMapper
+from .sap import SAPConnector
+from .oracle import OracleConnector
+from .netsuite import NetSuiteConnector
+
+__all__ = [
+    "ERPConnector",
+    "ERPDataModel",
+    "ProtocolHandler",
+    "DataMapper",
+    "SAPConnector",
+    "OracleConnector",
+    "NetSuiteConnector",
+]