feat: Goa GEL Blockchain e-Licensing Platform - Full Stack Implementation

Complete implementation of the Goa Government e-Licensing platform with:

Backend:
- NestJS API with JWT authentication
- PostgreSQL database with Knex ORM
- Redis caching and session management
- MinIO document storage
- Hyperledger Besu blockchain integration
- Multi-department workflow system
- Comprehensive API tests (266/282 passing)

Frontend:
- Angular 21 with standalone components
- Angular Material + TailwindCSS UI
- Visual workflow builder
- Document upload with progress tracking
- Blockchain explorer integration
- Role-based dashboards (Admin, Department, Citizen)
- E2E tests with Playwright (37 tests)

Infrastructure:
- Docker Compose orchestration
- Blockscout blockchain explorer
- Development and production configurations

backend/.env.example

@@ -0,0 +1,73 @@
+# ===========================================
+# Goa GEL Backend Environment Configuration
+# ===========================================
+
+# Application
+NODE_ENV=development
+PORT=3001
+API_VERSION=v1
+API_PREFIX=api
+
+# Database (PostgreSQL)
+DATABASE_HOST=localhost
+DATABASE_PORT=5432
+DATABASE_NAME=goa_gel_platform
+DATABASE_USER=postgres
+DATABASE_PASSWORD=postgres_secure_password
+DATABASE_SSL=false
+DATABASE_LOGGING=true
+
+# Blockchain (Hyperledger Besu)
+BESU_RPC_URL=http://localhost:8545
+BESU_CHAIN_ID=1337
+BESU_NETWORK_ID=2024
+CONTRACT_ADDRESS_LICENSE_NFT=0x0000000000000000000000000000000000000001
+CONTRACT_ADDRESS_APPROVAL_MANAGER=0x0000000000000000000000000000000000000002
+CONTRACT_ADDRESS_DEPARTMENT_REGISTRY=0x0000000000000000000000000000000000000003
+CONTRACT_ADDRESS_WORKFLOW_REGISTRY=0x0000000000000000000000000000000000000004
+PLATFORM_WALLET_PRIVATE_KEY=0x0000000000000000000000000000000000000000000000000000000000000001
+
+# MinIO (S3-Compatible Storage)
+MINIO_ENDPOINT=localhost
+MINIO_PORT=9000
+MINIO_ACCESS_KEY=minioadmin
+MINIO_SECRET_KEY=minioadmin_secure_password
+MINIO_BUCKET_DOCUMENTS=goa-gel-documents
+MINIO_USE_SSL=false
+
+# Redis
+REDIS_HOST=localhost
+REDIS_PORT=6379
+REDIS_PASSWORD=
+REDIS_DB=0
+
+# Security
+JWT_SECRET=your-super-secure-jwt-secret-key-min-32-chars
+JWT_EXPIRATION=1d
+JWT_REFRESH_EXPIRATION=7d
+API_KEY_SALT_ROUNDS=10
+WEBHOOK_SIGNATURE_ALGORITHM=sha256
+
+# File Upload
+MAX_FILE_SIZE=10485760
+ALLOWED_MIME_TYPES=application/pdf,image/jpeg,image/png,image/jpg
+
+# Rate Limiting
+RATE_LIMIT_TTL=60
+RATE_LIMIT_GLOBAL=100
+RATE_LIMIT_API_KEY=1000
+RATE_LIMIT_UPLOAD=10
+
+# Logging
+LOG_LEVEL=info
+LOG_FORMAT=json
+
+# CORS
+CORS_ORIGIN=http://localhost:3000
+CORS_CREDENTIALS=true
+
+# Swagger
+SWAGGER_ENABLED=true
+SWAGGER_TITLE=Goa GEL API
+SWAGGER_DESCRIPTION=Blockchain Document Verification Platform API
+SWAGGER_VERSION=1.0.0