feat: implement core Go application with web server

- Add Go modules with required dependencies (Gin, UUID, JWT, etc.)
- Implement main web server with landing page endpoint
- Add comprehensive API endpoints for health and status
- Include proper error handling and request validation
- Set up CORS middleware and security headers

output/configs/.env.prod.template

@@ -0,0 +1,70 @@
+# EMERGENCY PRODUCTION CONFIGURATION
+# Copy this file to .env.prod and fill in your values
+
+# Domain Configuration
+DOMAIN=yourdreamnamehere.com
+
+# Database Configuration (generate random passwords)
+DB_HOST=ydn-db
+DB_PORT=5432
+DB_USER=ydn_user
+DB_PASSWORD=CHANGE_THIS_SECURE_DB_PASSWORD_123
+DB_NAME=ydn_db
+DB_SSLMODE=require
+
+# Redis Configuration
+REDIS_HOST=ydn-redis
+REDIS_PORT=6379
+REDIS_PASSWORD=CHANGE_THIS_SECURE_REDIS_PASSWORD_456
+REDIS_DB=0
+
+# JWT Configuration
+JWT_SECRET=CHANGE_THIS_TO_VERY_LONG_RANDOM_JWT_SECRET_789
+
+# Stripe Configuration
+STRIPE_PUBLIC_KEY=pk_live_your_stripe_public_key
+STRIPE_SECRET_KEY=sk_live_your_stripe_secret_key
+STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret
+STRIPE_PRICE_ID=price_your_price_id
+
+# OVH Configuration
+OVH_ENDPOINT=ovh-eu
+OVH_APPLICATION_KEY=your_ovh_application_key
+OVH_APPLICATION_SECRET=your_ovh_application_secret
+OVH_CONSUMER_KEY=your_ovh_consumer_key
+
+# Email Configuration
+SMTP_HOST=smtp.yourprovider.com
+SMTP_PORT=587
+SMTP_USER=your_email@yourdomain.com
+SMTP_PASSWORD=your_smtp_password
+SMTP_FROM=noreply@yourdreamnamehere.com
+
+# Dolibarr Configuration
+DOLIBARR_API_TOKEN=your_dolibarr_api_token
+DOLIBARR_ADMIN_PASSWORD=CHANGE_THIS_ADMIN_PASSWORD
+
+# Monitoring
+GRAFANA_ADMIN_PASSWORD=CHANGE_THIS_GRAFANA_PASSWORD
+
+# Docker Configuration
+DOCKER_REGISTRY=your-registry.com/ydn-app
+VERSION=v1.0.0
+
+# Contact Information (for domain registration)
+YDN_CONTACT_FIRSTNAME=YourDreamNameHere
+YDN_CONTACT_LASTNAME=Customer
+YDN_CONTACT_PHONE=+1234567890
+YDN_CONTACT_COUNTRY=US
+YDN_TECH_CONTACT_FIRSTNAME=Technical
+YDN_TECH_CONTACT_LASTNAME=Support
+YDN_TECH_CONTACT_EMAIL=tech@yourdreamnamehere.com
+YDN_TECH_CONTACT_PHONE=+1234567890
+
+# Application Configuration
+APP_ENV=production
+LOG_LEVEL=info
+LOG_FORMAT=json
+CORS_ORIGINS=https://yourdreamnamehere.com
+RATE_LIMIT_REQUESTS=100
+RATE_LIMIT_WINDOW=1m