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.example

@@ -0,0 +1,72 @@
+# Environment Configuration
+# Copy this file to .env and fill in your actual values
+
+# Application
+APP_NAME=YourDreamNameHere
+APP_ENV=development
+APP_PORT=8080
+APP_HOST=0.0.0.0
+
+# Database
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=ydn_user
+DB_PASSWORD=your_secure_password
+DB_NAME=ydn_db
+DB_SSLMODE=disable
+
+# JWT
+JWT_SECRET=your_jwt_secret_key_here_make_it_long_and_random
+JWT_EXPIRY=24h
+
+# Stripe Configuration
+STRIPE_PUBLIC_KEY=pk_test_your_stripe_public_key
+STRIPE_SECRET_KEY=sk_test_your_stripe_secret_key
+STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret
+STRIPE_PRICE_ID=price_250usd_monthly
+
+# 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
+
+# Cloudron Configuration
+CLOUDRON_API_VERSION=v1
+CLOUDRON_INSTALL_TIMEOUT=1800
+
+# Dolibarr Configuration
+DOLIBARR_URL=https://your-dolibarr-instance.com
+DOLIBARR_API_TOKEN=your_dolibarr_api_token
+
+# Email Configuration (for sending Cloudron invites)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_USER=your_email@gmail.com
+SMTP_PASSWORD=your_app_password
+SMTP_FROM=noreply@yourdreamnamehere.com
+
+# Redis (for sessions)
+REDIS_HOST=localhost
+REDIS_PORT=6379
+REDIS_PASSWORD=
+REDIS_DB=0
+
+# Logging
+LOG_LEVEL=info
+LOG_FORMAT=json
+
+# Security
+CORS_ORIGINS=http://localhost:3000,https://yourdreamnamehere.com
+RATE_LIMIT_REQUESTS=100
+RATE_LIMIT_WINDOW=1m
+
+# 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