feat: add deployment assets and sanitize env template

Author: dineshsuthar123

.env.example

@@ -0,0 +1,92 @@
+# ===================================
+# SupplyChain-Auth Environment Template
+# Copy to `.env` and replace placeholder values locally
+# ===================================
+
+# Application Environment
+NODE_ENV=development
+REACT_APP_ENV=development
+
+# ===================================
+# API Configuration
+# ===================================
+REACT_APP_API_BASE_URL=http://localhost:8080
+REACT_APP_API_PRODUCTS_URL=http://localhost:8080/api/products
+REACT_APP_API_VERIFICATION_URL=http://localhost:8080/api/verify
+REACT_APP_API_EVENTS_URL=http://localhost:8080/api/events
+
+# Backend Service URLs
+PRODUCT_SERVICE_URL=http://localhost:8081
+VERIFICATION_SERVICE_URL=http://localhost:8082
+EVENT_SERVICE_URL=http://localhost:8083
+
+# ===================================
+# Database Configuration
+# ===================================
+MONGODB_URI=mongodb://localhost:27017/supplychain_auth
+MONGODB_DATABASE=supplychain_auth
+MONGODB_USERNAME=<mongo_username>
+MONGODB_PASSWORD=<mongo_password>
+
+REDIS_URL=redis://localhost:6379
+REDIS_PASSWORD=<redis_password>
+
+POSTGRES_URL=postgresql://localhost:5432/supplychain_auth
+POSTGRES_USERNAME=<postgres_username>
+POSTGRES_PASSWORD=<postgres_password>
+
+# ===================================
+# Blockchain Configuration (Free Testnet)
+# ===================================
+BLOCKCHAIN_NETWORK=sepolia
+ETHEREUM_RPC_URL=https://sepolia.infura.io/v3/<infura_project_id>
+PRIVATE_KEY=<private_key_for_testnet>
+CONTRACT_ADDRESS=<deployed_contract_address>
+
+# ===================================
+# Security Configuration
+# ===================================
+JWT_SECRET=<generate_strong_jwt_secret>
+JWT_EXPIRES_IN=24h
+JWT_REFRESH_EXPIRES_IN=7d
+ENCRYPTION_KEY=<32_byte_hex_key>
+
+# ===================================
+# External Services (Free Tiers)
+# ===================================
+EMAIL_SERVICE_API_KEY=<mailgun_api_key>
+EMAIL_FROM=<noreply@example.com>
+
+STORAGE_TYPE=local
+STORAGE_PATH=./uploads
+
+# ===================================
+# Monitoring & Logging
+# ===================================
+LOG_LEVEL=info
+METRICS_ENABLED=true
+METRICS_PORT=9090
+
+# ===================================
+# Application Settings
+# ===================================
+PORT=8080
+HOST=localhost
+CORS_ORIGINS=http://localhost:3000,https://your-app.vercel.app
+RATE_LIMIT_WINDOW_MS=900000
+RATE_LIMIT_MAX_REQUESTS=100
+
+# ===================================
+# Development Settings
+# ===================================
+DEBUG_MODE=true
+ENABLE_SWAGGER=true
+CHOKIDAR_USEPOLLING=true
+
+# ===================================
+# Production Overrides (set via deployment env)
+# ===================================
+# REACT_APP_API_BASE_URL=https://your-backend.example.com
+# MONGODB_URI=<production_mongodb_connection>
+# REDIS_URL=<production_redis_connection>
+# JWT_SECRET=<production_jwt_secret>

.gitignore

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+> Why do I have a folder named ".vercel" in my project?
+The ".vercel" folder is created when you link a directory to a Vercel project.
+
+> What does the "project.json" file contain?
+The "project.json" file contains:
+- The ID of the Vercel project that you linked ("projectId")
+- The ID of the user or team your Vercel project is owned by ("orgId")
+
+> Should I commit the ".vercel" folder?
+No, you should not share the ".vercel" folder with anyone.
+Upon creation, it will be automatically added to your ".gitignore" file.

.vercel/README.txt

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+{"projectId":"prj_u9G5HltwUQWjV3HNHZhQ5AH7wGwB","orgId":"team_z2VLeehZ3vv2r2hEfSFKEH3a"}