feat(config): add isModelAvailabilityServiceEnabled setting (#13777)

packages/cli/src/config/settingsSchema.ts

@@ -1291,6 +1291,15 @@ const SETTINGS_SCHEMA = {
           'Enables extension loading/unloading within the CLI session.',
         showInDialog: false,
       },
+      isModelAvailabilityServiceEnabled: {
+        type: 'boolean',
+        label: 'Enable Model Availability Service',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description: 'Enable model routing using new availability service.',
+        showInDialog: false,
+      },
       codebaseInvestigatorSettings: {
         type: 'object',
         label: 'Codebase Investigator Settings',