refactor: replace which with direct command execution for cross-platform compatibility

[Copilot]

The isCommandAvailable() method in NodePackageManager used the Unix/Linux-specific which command, causing failures on Windows systems.

Changes

• Replace which <command> pattern with direct command execution using <command> --version 2>/dev/null
• Aligns with existing cross-platform pattern used in CheckCommand::getNodeVersion() and CheckCommand::getNpmVersion()

Implementation

// Before
$this->shell->execute('which ' . $command . ' > /dev/null 2>&1');
return true;

// After
$output = trim($this->shell->execute($command . ' --version 2>/dev/null'));
return $output !== '';

This approach works because both npm and node support the --version flag, and the Shell service catches execution failures when commands don't exist.

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[Copilot]

Pull request overview

This PR refactors the isCommandAvailable() method in NodePackageManager to improve cross-platform compatibility by replacing the Unix/Linux-specific which command with direct command execution using the --version flag.

Changes:

• Replaced which <command> pattern with <command> --version 2>/dev/null approach
• Aligns with existing cross-platform pattern consistently used in CheckCommand methods