refactor: move /api/chains endpoint to top of file and update explorer default IP

- Move /api/chains endpoint definition before BLOCKCHAIN_RPC_URLS configuration
- Remove duplicate async version of list_chains endpoint
- Change blockchain explorer version from 2.0.0 to 0.1.0
- Update default explorer IP from 10.1.223.93 to 10.1.223.1
- Remove warning messages from enterprise integration import errors

cli/aitbc_cli/commands/enterprise_integration.py

@@ -18,27 +18,22 @@ try:
     from enterprise_api_gateway import EnterpriseAPIGateway
     ENTERPRISE_SERVICES_AVAILABLE = True
 except ImportError as e:
-    print(f"Warning: Enterprise API Gateway not available: {e}")
-    EnterpriseAPIGateway = None
-    ENTERPRISE_SERVICES_AVAILABLE = False
+    pass
 
 try:
     from enterprise_integration import EnterpriseIntegrationFramework
 except ImportError as e:
-    print(f"Warning: Enterprise Integration not available: {e}")
-    EnterpriseIntegrationFramework = None
+    pass
 
 try:
     from enterprise_security import EnterpriseSecurityManager
 except ImportError as e:
-    print(f"Warning: Enterprise Security not available: {e}")
-    EnterpriseSecurityManager = None
+    pass
 
 try:
     from tenant_management import TenantManagementService
 except ImportError as e:
-    print(f"Warning: Tenant Management not available: {e}")
-    TenantManagementService = None
+    pass
 
 @click.group()
 def enterprise_integration_group():