fix: use script command for PTY instead of modifying SSHService

- Revert SSHService exec() back to original (remove PTY parameter)
- AgentService now writes installer to /tmp/ first, then runs via
  script -q -c to create a PTY for sudo (handles requiretty)
- Falls back to direct sudo bash if script is unavailable
- Cleans up temp files after execution
- Added mkdir -p for /usr/local/bin in installer
- Added file verification and byte-count after writing agent binary

src/Services/AgentService.php

@@ -51,9 +51,11 @@ class AgentService
 
         $b64 = base64_encode($script);
         $remoteCommand = sprintf(
-            'echo %s | base64 -d | sudo bash -s -- %s %s 2>&1',
+            'echo %s | base64 -d > /tmp/_sm_install.sh && chmod +x /tmp/_sm_install.sh && (script -q -c "sudo bash /tmp/_sm_install.sh %s %s" /dev/null < /dev/null 2>/dev/null || sudo bash /tmp/_sm_install.sh %s %s) 2>&1; rc=$?; rm -f /tmp/_sm_install.sh; exit $rc',
             escapeshellarg($b64),
             escapeshellarg($serverUrl),
+            escapeshellarg($agentKey),
+            escapeshellarg($serverUrl),
             escapeshellarg($agentKey)
         );
 
@@ -63,7 +65,7 @@ class AgentService
                 return ['success' => false, 'error' => 'SSH connection failed'];
             }
 
-            $result = $ssh->exec($remoteCommand, 120, true);
+            $result = $ssh->exec($remoteCommand, 120);
             $ssh->disconnect();
 
             $output = trim($result['output']);
@@ -117,7 +119,7 @@ class AgentService
         $script = file_get_contents($scriptPath);
 
         $remoteCommand = sprintf(
-            'echo %s | base64 -d | sudo bash 2>&1',
+            'echo %s | base64 -d > /tmp/_sm_uninstall.sh && chmod +x /tmp/_sm_uninstall.sh && (script -q -c "sudo bash /tmp/_sm_uninstall.sh" /dev/null < /dev/null 2>/dev/null || sudo bash /tmp/_sm_uninstall.sh) 2>&1; rc=$?; rm -f /tmp/_sm_uninstall.sh; exit $rc',
             escapeshellarg(base64_encode($script))
         );
 
@@ -127,7 +129,7 @@ class AgentService
                 return ['success' => false, 'error' => 'SSH connection failed'];
             }
 
-            $result = $ssh->exec($remoteCommand, 60, true);
+            $result = $ssh->exec($remoteCommand, 60);
             $ssh->disconnect();
 
             $output = trim($result['output']);