init Backend

Backend/.env.example

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+# Environment
+NODE_ENV=development
+PORT=4000
+APP_URL=http://localhost:4000
+
+# Database
+DATABASE_URL=postgresql://elearning_user:elearning_pass@localhost:5432/elearning_db
+
+# Redis
+REDIS_URL=redis://localhost:6379
+
+# JWT
+JWT_SECRET=your-super-secret-jwt-key-change-this-in-production
+JWT_EXPIRES_IN=24h
+JWT_REFRESH_EXPIRES_IN=7d
+
+# MinIO/S3
+S3_ENDPOINT=http://localhost:9000
+S3_ACCESS_KEY=minioadmin
+S3_SECRET_KEY=minioadmin
+S3_BUCKET_NAME=elearning
+S3_USE_SSL=false
+
+# CORS
+CORS_ORIGIN=http://localhost:3000,http://localhost:5173
+
+# File Upload Limits (in bytes)
+MAX_VIDEO_SIZE=524288000
+MAX_ATTACHMENT_SIZE=104857600
+MAX_ATTACHMENTS_PER_LESSON=10
+
+# Email (Mailhog for development)
+SMTP_HOST=localhost
+SMTP_PORT=1025
+SMTP_USER=
+SMTP_PASS=
+SMTP_FROM=noreply@elearning.local
+
+# Rate Limiting
+RATE_LIMIT_WINDOW_MS=900000
+RATE_LIMIT_MAX_REQUESTS=100
+
+# Logging
+LOG_LEVEL=debug