🛡️ Sentinel: [CRITICAL] Fix command injection in terminal API

[LebToki]

🚨 Severity: CRITICAL
💡 Vulnerability: Command Injection in terminal API execution. isAllowedCommand previously checked if a command string started with a permitted prefix (e.g. npm), but an attacker could append a chained payload (e.g. npm run; rm -rf /) which was passed directly to proc_open.
🎯 Impact: Attackers could execute arbitrary system shell commands leading to total system compromise.
🔧 Fix: Added a robust validation check using preg_match to prevent the use of shell chaining operators and metacharacters (;, &, |, `, $, <, >, \n).
✅ Verification: Ran php tests/SecurityTest.php and php -l public/api/terminal.php. Also verified no state files are accidentally included in the PR.

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PR created automatically by Jules for task 2938634573487380212 started by @LebToki

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