Implement core application features

.env.example

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+# Vessel Maintenance AI System - Enterprise Configuration
+# Copy this file to .env and customize for your environment
+
+# =============================================================================
+# APPLICATION SETTINGS
+# =============================================================================
+APP_NAME="Vessel Maintenance AI System - Enterprise"
+APP_VERSION="2.0.0"
+ENVIRONMENT="development"  # development, staging, production
+DEBUG=false
+
+# =============================================================================
+# SERVER CONFIGURATION
+# =============================================================================
+HOST="0.0.0.0"
+PORT=8000
+WORKERS=4
+
+# =============================================================================
+# MULTI-TENANT CONFIGURATION
+# =============================================================================
+MULTI_TENANT_ENABLED=true
+TENANT_ISOLATION_LEVEL="database"  # database, schema, row
+DEFAULT_TENANT_ID="default"
+MAX_TENANTS=100
+
+# =============================================================================
+# DATABASE CONFIGURATION
+# =============================================================================
+DATABASE_BACKEND="sqlite"  # sqlite, postgresql, mysql
+DATABASE_URL="sqlite:///./data/vessel_maintenance.db"
+DATABASE_POOL_SIZE=20
+DATABASE_MAX_OVERFLOW=30
+DATABASE_POOL_TIMEOUT=30
+
+# PostgreSQL Configuration (if using PostgreSQL)
+POSTGRES_HOST="localhost"
+POSTGRES_PORT=5432
+POSTGRES_USER="vessel_admin"
+POSTGRES_PASSWORD="your_secure_password"
+POSTGRES_DATABASE="vessel_maintenance"
+
+# MySQL Configuration (if using MySQL)
+MYSQL_HOST="localhost"
+MYSQL_PORT=3306
+MYSQL_USER="vessel_admin"
+MYSQL_PASSWORD="your_secure_password"
+MYSQL_DATABASE="vessel_maintenance"
+
+# =============================================================================
+# AUTHENTICATION AND SECURITY
+# =============================================================================
+AUTH_PROVIDER="local"  # local, ldap, oauth2, saml
+SECRET_KEY="your-super-secret-key-change-in-production-minimum-32-characters"
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+REFRESH_TOKEN_EXPIRE_DAYS=7
+
+# LDAP Configuration (if using LDAP)
+LDAP_SERVER=""
+LDAP_PORT=389
+LDAP_BASE_DN=""
+LDAP_USER_DN=""
+LDAP_PASSWORD=""
+
+# OAuth2 Configuration (if using OAuth2)
+OAUTH2_CLIENT_ID=""
+OAUTH2_CLIENT_SECRET=""
+OAUTH2_SERVER_URL=""
+
+# =============================================================================
+# RATE LIMITING
+# =============================================================================
+RATE_LIMITING_ENABLED=true
+RATE_LIMIT_PER_MINUTE=60
+RATE_LIMIT_PER_HOUR=1000
+RATE_LIMIT_PER_DAY=10000
+RATE_LIMIT_BURST=10
+
+# =============================================================================
+# CACHING CONFIGURATION
+# =============================================================================
+CACHE_BACKEND="memory"  # memory, redis, memcached
+CACHE_TTL=3600
+REDIS_URL="redis://localhost:6379/0"
+REDIS_PASSWORD=""
+
+# =============================================================================
+# BACKGROUND PROCESSING
+# =============================================================================
+CELERY_BROKER_URL="redis://localhost:6379/1"
+CELERY_RESULT_BACKEND="redis://localhost:6379/2"
+BATCH_PROCESSING_ENABLED=true
+MAX_BATCH_SIZE=100
+
+# =============================================================================
+# SECURITY AND ENCRYPTION
+# =============================================================================
+ENCRYPTION_ENABLED=true
+ENCRYPTION_KEY=""  # Leave empty to auto-generate
+DATA_AT_REST_ENCRYPTION=true
+SSL_ENABLED=false
+SSL_CERT_PATH=""
+SSL_KEY_PATH=""
+
+# =============================================================================
+# CORS CONFIGURATION
+# =============================================================================
+CORS_ORIGINS="*"  # Comma-separated list or "*" for all
+CORS_ALLOW_CREDENTIALS=true
+CORS_ALLOW_METHODS="*"
+CORS_ALLOW_HEADERS="*"
+
+# =============================================================================
+# MONITORING AND OBSERVABILITY
+# =============================================================================
+MONITORING_ENABLED=true
+METRICS_ENDPOINT="/metrics"
+HEALTH_CHECK_ENDPOINT="/health"
+LOG_LEVEL="INFO"
+STRUCTURED_LOGGING=true
+
+# =============================================================================
+# REAL-TIME NOTIFICATIONS
+# =============================================================================
+NOTIFICATIONS_ENABLED=true
+WEBSOCKET_ENABLED=true
+EMAIL_NOTIFICATIONS=false
+SMS_NOTIFICATIONS=false
+
+# Email Configuration (if using email notifications)
+SMTP_SERVER=""
+SMTP_PORT=587
+SMTP_USERNAME=""
+SMTP_PASSWORD=""
+SMTP_USE_TLS=true
+
+# =============================================================================
+# AI AND ML CONFIGURATION
+# =============================================================================
+CUSTOM_MODELS_ENABLED=true
+MODEL_TRAINING_ENABLED=false
+MODEL_STORAGE_PATH="./models"
+AUTO_MODEL_UPDATES=false
+
+# =============================================================================
+# ANALYTICS AND REPORTING
+# =============================================================================
+ADVANCED_ANALYTICS_ENABLED=true
+PREDICTIVE_ANALYTICS=true
+TREND_ANALYSIS=true
+ANALYTICS_RETENTION_DAYS=365
+
+# =============================================================================
+# COMPLIANCE AND AUDIT
+# =============================================================================
+AUDIT_LOGGING=true
+GDPR_COMPLIANCE=true
+DATA_RETENTION_DAYS=2555  # 7 years
+AUDIT_LOG_RETENTION_DAYS=2555
+
+# =============================================================================
+# MARITIME STANDARDS
+# =============================================================================
+IMO_COMPLIANCE=true
+MARITIME_STANDARDS_VALIDATION=true
+
+# =============================================================================
+# FILE UPLOAD CONFIGURATION
+# =============================================================================
+MAX_FILE_SIZE=52428800  # 50MB in bytes
+ALLOWED_FILE_TYPES=".txt,.pdf,.doc,.docx,.csv,.json"
+
+# =============================================================================
+# API CONFIGURATION
+# =============================================================================
+API_PREFIX="/api/v1"
+DOCS_URL="/docs"
+REDOC_URL="/redoc"
+
+# =============================================================================
+# PRODUCTION RECOMMENDATIONS
+# =============================================================================
+# For production deployment, ensure you:
+# 1. Set ENVIRONMENT="production"
+# 2. Use a strong SECRET_KEY (minimum 32 characters)
+# 3. Configure appropriate CORS_ORIGINS (not "*")
+# 4. Set up PostgreSQL or MySQL instead of SQLite
+# 5. Configure Redis for caching and background processing
+# 6. Enable SSL with proper certificates
+# 7. Set up proper SMTP for email notifications
+# 8. Configure monitoring and alerting
+# 9. Set up automated backups
+# 10. Configure log aggregation and monitoring