feat: Implement module permissions system with database-driven access control

- Added `users_permissions` table for managing user permissions.
- Created `PermissionRepository` for handling permission logic.
- Refactored `controls\Users::permissions()` to utilize the new database structure.
- Introduced AJAX endpoint for saving user permissions.
- Enhanced user management UI with permission checkboxes.
- Added vacation management template for handling employee absences.
- Implemented tests for `PermissionRepository`.

.htaccess

@@ -22,7 +22,7 @@ RewriteCond %{REQUEST_URI}  !^(.*)/resources/(.*) [NC]
 RewriteCond %{REQUEST_URI}  !^(.*)/images/(.*) [NC]
 RewriteCond %{REQUEST_URI}  !^(.*)/posters_images/(.*) [NC]
 RewriteCond %{REQUEST_URI}  !^(.*)/upload/(.*) [NC]
-RewriteRule ^([^/]*)/([^/]*)/(.*)$ index.php?module=$1&action=$2&$3 [L]
+RewriteRule ^([^/]*)/([^/]*)/(.*)$ index.php?module=$1&action=$2&$3 [QSA,L]
 
 RewriteRule ^logowanie$ index.php?module=users&action=login_form [L]
 RewriteRule ^finances/tags.json$ index.php?module=finances&action=tags_json [L]