feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/config/__init__.py

@@ -0,0 +1,74 @@
+# -*- coding: utf-8 -*-
+"""
+Configuration Package for MYP Platform
+======================================
+
+This package contains all configuration modules for the Mercedes-Benz 3D Printing Platform.
+
+Modules:
+    - security: Security configuration and middleware
+    - database: Database configuration and settings
+    - logging: Logging configuration
+    - app_config: Main application configuration
+"""
+
+__version__ = "2.0.0"
+__author__ = "MYP Development Team"
+
+# Import main configuration modules
+try:
+    from .security import SecurityConfig, get_security_headers
+    from .app_config import Config, DevelopmentConfig, ProductionConfig, TestingConfig
+except ImportError as e:
+    print(f"Warning: Could not import configuration modules: {e}")
+    # Fallback configurations
+    SecurityConfig = None
+    get_security_headers = None
+    Config = None
+
+# Export main configuration classes
+__all__ = [
+    'SecurityConfig',
+    'get_security_headers',
+    'Config',
+    'DevelopmentConfig', 
+    'ProductionConfig',
+    'TestingConfig'
+]
+
+def get_config(config_name='development'):
+    """
+    Get configuration object based on environment name.
+    
+    Args:
+        config_name (str): Configuration environment name
+        
+    Returns:
+        Config: Configuration object
+    """
+    configs = {
+        'development': DevelopmentConfig,
+        'production': ProductionConfig,
+        'testing': TestingConfig
+    }
+    
+    return configs.get(config_name, DevelopmentConfig)
+
+def validate_config(config_obj):
+    """
+    Validate configuration object.
+    
+    Args:
+        config_obj: Configuration object to validate
+        
+    Returns:
+        bool: True if valid, False otherwise
+    """
+    required_attrs = ['SECRET_KEY', 'DATABASE_URL']
+    
+    for attr in required_attrs:
+        if not hasattr(config_obj, attr):
+            print(f"Missing required configuration: {attr}")
+            return False
+    
+    return True