• Add server environment variables database table and model
• Implement CRUD operations for server environment variables
• Add automatic server identity variables (COOLIFY_SERVER_*)
• Modify deployment logic to merge server-level env vars
• Add UI components for managing server environment variables
• Add API endpoints for server environment variables
• Update server sidebar with environment variables menu
• Ensure proper precedence: system → server → application env vars
• Support build-time and runtime server environment variables
• Maintain backward compatibility with existing deployments
• Removed COOLIFY_SERVER_IP and COOLIFY_SERVER_HOSTNAME variables completely
• Kept only non-sensitive identifiers: COOLIFY_SERVER_ID - Internal database ID COOLIFY_SERVER_NAME - User-defined server name COOLIFY_SERVER_UUID - Randomly generated UUID

Resolves: Multi-server deployments now receive server-specific environment variables

Changes

• Database: Added server_environment_variables table with encrypted storage
• Models: Created ServerEnvironmentVariable model with polymorphic relationships
• API: Added CRUD endpoints for server environment variables management
• UI: Added Livewire component and Blade templates for server env var management
• Deployment: Modified ApplicationDeploymentJob to merge server-level env vars
• Identity: Added automatic COOLIFY_SERVER_* variables for server identification
• Navigation: Updated server sidebar with environment variables menu item
• Security: Implemented encrypted storage and proper access controls

##Issues fix #7738

/claim #7738