Add more input validation in ServerController. #246

Job	Run time
PHP Syntax Linting	6s
Validate dependencies file	7s
PHP Version Compatibility (8.3)	11s
php-lint-quality	7s
PHP Version Compatibility (8.2)	8s
PHP Version Compatibility (8.1)	11s
Scan Dependencies Vulnerabilities	5s
PHP Unit Tests (29)	41s
PHP Unit Tests (28)	39s
PHP Unit Tests (30)	48s
	3m 3s

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