Updates the Orchestrator IP/domain that appliances use to connect.

Behavior:

• If customDefaultIP is empty, appliances use Orchestrator's internal management IP
• Label entries allow different IPs for appliances based on WAN interface labels
• Lower priority numbers are checked first (priority 1 before priority 2)
• The internalManagementIP field is ignored in requests (auto-populated by Orchestrator)

Validation Rules:

• customDefaultIP and label ipOrDns must not contain slashes (not full URLs)
• Priority values must be non-negative integers (>= 0)
• Label field must be a non-null object (use empty object {} if no labels needed)
• In container mode, customDefaultIP cannot be empty

Side Effects:

• Action is logged to system action log with user and data details
• Changes affect appliance connectivity on next configuration sync