feat(setup): default OneCLI remote URL to https://app.onecli.sh

Replaces the example.internal placeholder with the hosted gateway URL
so the advanced screen and --help suggest the canonical destination
out of the box.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

setup/lib/setup-config.ts

@@ -70,7 +70,8 @@ export const CONFIG: Entry[] = [
     surface: 'flag+ui',
     group: 'OneCLI',
     type: 'url',
-    placeholder: 'https://vault.example.internal',
+    default: 'https://app.onecli.sh',
+    placeholder: 'https://app.onecli.sh',
     validate: httpUrl,
   },
   {