feat: Add OAuth email integration and production deployment config

- Add OAuthCredential model for storing Google/Microsoft OAuth tokens
- Add email provider auto-detection endpoint (Gmail, Outlook, Yahoo, etc.)
- Add EmailConfigWizard frontend component with step-by-step setup
- Add OAuth flow endpoints for Google and Microsoft XOAUTH2
- Update production settings to make AWS, Sentry, Mailgun optional
- Update Traefik config for wildcard subdomain routing
- Add logo resize utility script

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

smoothschedule/pyproject.toml

@@ -198,4 +198,8 @@ dependencies = [
     "dj-stripe>=2.9.0",
     "django-csp==3.8.0",
     "twilio>=9.0.0",
+    "dnspython>=2.6.0",
+    "google-auth>=2.0.0",
+    "google-auth-oauthlib>=1.0.0",
+    "msal>=1.24.0",
 ]