Add n8n test mode toggle and edge function improvements

- Add test/production toggle for n8n webhook URLs in IntegrasiTab
- Update create-meet-link function to use database test_mode setting
- Add send-email-v2 edge function for Mailketing API integration
- Update daily-reminders and send-consultation-reminder to use send-email-v2
- Remove deprecated branding field from BrandingTab
- Update domain references from hub.dwindi.com to with.dwindi.com
- Add environment variables for Coolify deployment
- Add comprehensive edge function test script
- Update payment flow redirect to order detail page

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.env.example

@@ -6,6 +6,10 @@ VITE_SUPABASE_EDGE_URL=your_supabase_url_here/functions/v1
 # Application Configuration
 VITE_APP_NAME=Access Hub
 VITE_APP_ENV=production
+SITE_URL=https://with.dwindi.com/
+
+# Google Integration
+VITE_GOOGLE_CLIENT_ID=your_google_oauth_client_id_here
 
 # Third-party Integrations
 VITE_PAKASIR_API_KEY=your_pakasir_api_key_here