Improve session cookie security with HttpOnly and SameSite attributes
Add security headers via .htaccess
Block direct access to sensitive files
Restrict allowed HTTP methods
Document cPanel-specific security configuration
Add container hardening for ServerTokens and ServerSignature
Add support for specifying Listmonk list UUIDs per form instance
Update petition form to use metadata-defined UUIDs
Add success confirmation message to newsletter forms
Update documentation with new functionality
