scripts: 🛡️ Sentinel: [CRITICAL] Fix command injection in feeds update

[ManupaKDU]

🚨 Severity: CRITICAL
💡 Vulnerability: Unquoted variable interpolation in a system() shell command in scripts/feeds.
🎯 Impact: An attacker who controls a feed name could inject arbitrary shell commands during feed initialization. Specifically, $safename and $localpath_orig were interpolated into a shell string without being enclosed in single quotes, despite having their own single quotes escaped.
🔧 Fix: Wrapped the interpolated variables $safename, $localpath_orig, and $flags->{'root'} in single quotes within the system() call to prevent shell word splitting and injection.
✅ Verification: Verified by manual inspection and running perl -c scripts/feeds to check syntax.

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PR created automatically by Jules for task 2887205039955759445 started by @manupawickramasinghe

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