[extensions] Add extension management install command (#6703)

packages/cli/src/config/settingsSchema.ts

@@ -535,6 +535,15 @@ export const SETTINGS_SCHEMA = {
     description: 'Show line numbers in the chat.',
     showInDialog: true,
   },
+  extensionManagement: {
+    type: 'boolean',
+    label: 'Extension Management',
+    category: 'Feature Flag',
+    requiresRestart: true,
+    default: false,
+    description: 'Enable extension management features.',
+    showInDialog: false,
+  },
   skipNextSpeakerCheck: {
     type: 'boolean',
     label: 'Skip Next Speaker Check',