Add failsafes to vv_push_master_conf before SCPing

Single SSH probe per remote checks all three conditions in one call:
- plugin cfg exists (varaverk.cfg present with SCRIPTS_DIR)
- Configurations/ dir exists at that path
- master.conf already present on remote

Any failure skips that host entirely rather than pushing blind.
Uses the discovered SCRIPTS_DIR as the SCP destination, not ours.

Plugin/unraid/include/config.php

@@ -37,14 +37,26 @@ function vv_push_master_conf(): array {
             continue;
         }
 
-        // Query the remote's varaverk.cfg so we SCP to their actual SCRIPTS_DIR,
-        // not ours — they may use a different appdata path (e.g. /mnt/cache vs /mnt/user).
-        $sshBase     = 'ssh -i ' . escapeshellarg($sshKey)
-                     . ' -o ConnectTimeout=10 -o StrictHostKeyChecking=no root@' . $ip;
-        $remoteCfg   = trim(shell_exec($sshBase . ' "grep SCRIPTS_DIR /boot/config/plugins/varaverk/varaverk.cfg 2>/dev/null"') ?: '');
-        preg_match('/SCRIPTS_DIR\s*=\s*["\']?([^"\']+)["\']?/', $remoteCfg, $sm);
-        $remoteConf  = rtrim($sm[1] ?? '/mnt/user/appdata/Varaverk', '/') . '/Configurations';
+        // Single SSH call: get remote SCRIPTS_DIR and verify plugin is installed,
+        // Configurations/ exists, and master.conf is already present.
+        // Any missing piece means the remote isn't ready — skip rather than push blind.
+        $sshBase  = 'ssh -i ' . escapeshellarg($sshKey)
+                  . ' -o ConnectTimeout=10 -o StrictHostKeyChecking=no root@' . $ip;
+        $probe    = trim(shell_exec(
+            $sshBase . ' "cfg=$(grep SCRIPTS_DIR /boot/config/plugins/varaverk/varaverk.cfg 2>/dev/null)'
+            . ' && sd=$(echo \"$cfg\" | grep -oP \'(?<=SCRIPTS_DIR=\")[^\"]+\')'
+            . ' && test -d \"${sd}/Configurations\"'
+            . ' && test -f \"${sd}/Configurations/master.conf\"'
+            . ' && echo \"$sd\""'
+        ) ?: '');
 
+        if ($probe === '') {
+            $results[] = ['host' => $hostKey, 'ok' => false,
+                          'error' => 'plugin not installed, dir missing, or master.conf absent — skipped'];
+            continue;
+        }
+
+        $remoteConf = rtrim($probe, '/') . '/Configurations';
         $dest = escapeshellarg('root@' . $ip . ':' . $remoteConf . '/master.conf');
         $cmd  = 'scp -i ' . escapeshellarg($sshKey)
               . ' -o ConnectTimeout=10 -o StrictHostKeyChecking=no'