🛡️ Sentinel: [security improvement]

[acebytes]

🚨 Severity: MEDIUM
💡 Vulnerability: Defense-in-depth weakness: executing docker system prune via /bin/bash -c.
🎯 Impact: Hardcoded shell execution limits future safety if dynamic arguments are later introduced, increasing risk of command injection.
🔧 Fix: Refactored dockerPrune to invoke docker directly via /usr/bin/env and handled standard error redirection (2>&1) securely by assigning the same Pipe() to standardOutput and standardError.
✅ Verification: Run tests and ensure the Docker pruning UI still functions correctly.

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PR created automatically by Jules for task 3326971138767591587 started by @acebytes

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