Configure for self-hosted deployment

- Add environment variable support for Supabase and Pakasir configurations
- Create Docker configuration with Nginx for production deployment
- Add .env.example with all required environment variables
- Remove hardcoded URLs from Supabase client and Checkout component
- Add Docker and Nginx configuration files for Coolify deployment

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

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

.env.example

@@ -0,0 +1,25 @@
+# Supabase Configuration
+VITE_SUPABASE_URL=your_supabase_url_here
+VITE_SUPABASE_ANON_KEY=your_supabase_anon_key_here
+VITE_SUPABASE_EDGE_URL=your_supabase_url_here/functions/v1
+
+# Application Configuration
+VITE_APP_NAME=Access Hub
+VITE_APP_ENV=production
+
+# Third-party Integrations
+VITE_PAKASIR_API_KEY=your_pakasir_api_key_here
+VITE_PAKASIR_PROJECT_SLUG=your_pakasir_project_slug
+
+# Payment Configuration (if needed)
+# VITE_MIDTRANS_CLIENT_KEY=your_midtrans_client_key
+
+# Email Configuration (for edge functions)
+# These will be set in Supabase Edge Function secrets
+# SMTP_HOST=your_smtp_host
+# SMTP_USER=your_smtp_user
+# SMTP_PASS=your_smtp_password
+
+# Other Configuration
+VITE_ENABLE_ANALYTICS=false
+VITE_DEBUG=false