🛡️ Sentinel: [CRITICAL] Fix Path Traversal Bypass

[LebToki]

🚨 Severity: CRITICAL
💡 Vulnerability: Path traversal / Authorization Bypass where a user could access sibling directories by creating a directory sharing the same prefix as an allowed directory (e.g., /var/www_backup when /var/www is allowed).
🎯 Impact: Attackers could gain unauthorized access to read, create, delete, or rename files and directories outside of their allowed workspaces or system folders, compromising the security of the host system.
🔧 Fix: Modified the path validation logic across the API endpoints to strictly enforce directory boundaries by appending a trailing slash (/) to the allowed directory path before performing the prefix check using strpos. Also added exact match checks for the root of the allowed directory.
✅ Verification: Ran php tests/SecurityTest.php and manually verified with test scripts that unauthorized path bypasses are now correctly rejected.

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PR created automatically by Jules for task 13539185397145297378 started by @LebToki

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