Fix SSH command quoting — pass cmd directly, drop sh -c wrapper

updater/src/index.js

@@ -133,7 +133,7 @@ async function sshExec(host, command) {
       '-o', 'UserKnownHostsFile=/dev/null',
       '-o', 'ConnectTimeout=5',
       `root@${host}`,
-      'sh', '-c', command,
+      command,
     ], { shell: false })
     let stdout = '', stderr = ''
     child.stdout?.on('data', d => { stdout += d })
@@ -208,7 +208,7 @@ async function runRemote(target, repoName, cmd, label) {
       '-o', 'StrictHostKeyChecking=no',
       '-o', 'UserKnownHostsFile=/dev/null',
       `root@${target.host}`,
-      'sh', '-c', cmd,
+      cmd,
     ], { timeout: 300_000 })
     entry.status = 'success'
     entry.output = stdout.slice(-500)