feat(billing): implement G1 AI credits overage flow with billing telemetry (#18590)

packages/cli/src/config/settingsSchema.ts

@@ -828,6 +828,36 @@ const SETTINGS_SCHEMA = {
     ref: 'TelemetrySettings',
   },
 
+  billing: {
+    type: 'object',
+    label: 'Billing',
+    category: 'Advanced',
+    requiresRestart: false,
+    default: {},
+    description: 'Billing and AI credits settings.',
+    showInDialog: false,
+    properties: {
+      overageStrategy: {
+        type: 'enum',
+        label: 'Overage Strategy',
+        category: 'Advanced',
+        requiresRestart: false,
+        default: 'ask',
+        description: oneLine`
+          How to handle quota exhaustion when AI credits are available.
+          'ask' prompts each time, 'always' automatically uses credits,
+          'never' disables credit usage.
+        `,
+        showInDialog: true,
+        options: [
+          { value: 'ask', label: 'Ask each time' },
+          { value: 'always', label: 'Always use credits' },
+          { value: 'never', label: 'Never use credits' },
+        ],
+      },
+    },
+  },
+
   model: {
     type: 'object',
     label: 'Model',