Add Google Workspace setup wizard to onboarding

- Add stepGoogle() wizard that guides users through gog CLI setup
- Check/install gog via Homebrew, guide OAuth credential setup
- Let users select existing accounts or add new ones
- Configure which Google services to enable (gmail, calendar, drive, etc.)
- Add GoogleConfig type and integrations.google to config schema
- Wire GMAIL_ACCOUNT env var from YAML config for polling service
- Add discord.js dependency (fixes build)

🐙 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

package.json

@@ -59,6 +59,6 @@
   "optionalDependencies": {
     "@slack/bolt": "^4.6.0",
     "@whiskeysockets/baileys": "^6.7.21",
-    "discord.js": "^14.18.0"
+    "discord.js": "^14.25.1"
   }
 }