Add configuration, utilities, and update server with enhanced monitoring features

- Add config.py for environment configuration management
- Add utils.py with utility functions
- Add .env.example for environment variable reference
- Add routes_example.py as route reference
- Add login.html template for authentication
- Update server.py with enhancements
- Update all dashboard and log templates
- Move documentation to 'explanations and old code' directory
- Update database schema

.env.example

@@ -0,0 +1,45 @@
+# Environment configuration file for Server Monitorizare
+# Copy this file to .env and update with your values
+
+# Flask Configuration
+FLASK_ENV=development
+FLASK_DEBUG=True
+
+# Server Configuration
+HOST=0.0.0.0
+PORT=80
+SECRET_KEY=your-secret-key-change-in-production
+
+# Database Configuration
+DATABASE_PATH=data/database.db
+
+# Security - API Keys
+API_KEY=your-secure-api-key-here
+
+# Timeouts
+REQUEST_TIMEOUT=30
+DEVICE_TIMEOUT=10
+BULK_OPERATION_MAX_THREADS=10
+
+# Logging
+LOG_LEVEL=INFO
+LOG_FILE=logs/app.log
+LOG_MAX_BYTES=10485760
+LOG_BACKUP_COUNT=10
+
+# Caching
+CACHE_TYPE=simple
+CACHE_DEFAULT_TIMEOUT=300
+
+# Pagination
+DEFAULT_PAGE_SIZE=20
+MAX_PAGE_SIZE=100
+
+# Rate Limiting
+RATE_LIMIT_ENABLED=True
+RATE_LIMIT_DEFAULT=200 per day, 50 per hour
+
+# Backup
+BACKUP_ENABLED=True
+BACKUP_DIR=backups
+BACKUP_RETENTION=10