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

config.py

@@ -0,0 +1,81 @@
+# Configuration file for Server Monitorizare
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+class Config:
+    """Base configuration"""
+    # Database
+    DATABASE_PATH = os.getenv('DATABASE_PATH', 'data/database.db')
+    
+    # Server
+    DEBUG = os.getenv('DEBUG', 'False').lower() == 'true'
+    PORT = int(os.getenv('PORT', 80))
+    HOST = os.getenv('HOST', '0.0.0.0')
+    
+    # Security
+    SECRET_KEY = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')
+    API_KEY = os.getenv('API_KEY', 'default-api-key')
+    
+    # Timeouts & Limits
+    REQUEST_TIMEOUT = int(os.getenv('REQUEST_TIMEOUT', 30))
+    DEVICE_TIMEOUT = int(os.getenv('DEVICE_TIMEOUT', 10))
+    BULK_OPERATION_MAX_THREADS = int(os.getenv('BULK_OPERATION_MAX_THREADS', 10))
+    
+    # Logging
+    LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO')
+    LOG_FILE = os.getenv('LOG_FILE', 'logs/app.log')
+    LOG_MAX_BYTES = int(os.getenv('LOG_MAX_BYTES', 10485760))  # 10MB
+    LOG_BACKUP_COUNT = int(os.getenv('LOG_BACKUP_COUNT', 10))
+    
+    # Caching
+    CACHE_TYPE = os.getenv('CACHE_TYPE', 'simple')
+    CACHE_DEFAULT_TIMEOUT = int(os.getenv('CACHE_DEFAULT_TIMEOUT', 300))
+    
+    # Pagination
+    DEFAULT_PAGE_SIZE = int(os.getenv('DEFAULT_PAGE_SIZE', 20))
+    MAX_PAGE_SIZE = int(os.getenv('MAX_PAGE_SIZE', 100))
+    
+    # Rate Limiting
+    RATE_LIMIT_ENABLED = os.getenv('RATE_LIMIT_ENABLED', 'True').lower() == 'true'
+    RATE_LIMIT_DEFAULT = os.getenv('RATE_LIMIT_DEFAULT', '200 per day, 50 per hour')
+    
+    # Backup
+    BACKUP_ENABLED = os.getenv('BACKUP_ENABLED', 'True').lower() == 'true'
+    BACKUP_DIR = os.getenv('BACKUP_DIR', 'backups')
+    BACKUP_RETENTION = int(os.getenv('BACKUP_RETENTION', 10))  # Keep last N backups
+
+
+class DevelopmentConfig(Config):
+    """Development configuration"""
+    DEBUG = True
+    LOG_LEVEL = 'DEBUG'
+
+
+class ProductionConfig(Config):
+    """Production configuration"""
+    DEBUG = False
+    LOG_LEVEL = 'INFO'
+
+
+class TestingConfig(Config):
+    """Testing configuration"""
+    TESTING = True
+    DATABASE_PATH = ':memory:'
+    CACHE_TYPE = 'null'
+    DEBUG = True
+
+
+def get_config(env=None):
+    """Get configuration based on environment"""
+    if env is None:
+        env = os.getenv('FLASK_ENV', 'development')
+    
+    config_map = {
+        'development': DevelopmentConfig,
+        'production': ProductionConfig,
+        'testing': TestingConfig,
+    }
+    
+    return config_map.get(env, DevelopmentConfig)