API key: use space separator, fix error-capture bug; add conf_sync and missing files from dev

unRAID API rejects underscores and hyphens in key names — only letters, numbers,
and spaces allowed. Varaverk_HOST1 / Varaverk_Gmer4Lfe both fail; now uses
"Varaverk <hostname>" (space). Also adds monitor_remote.php, conf_populate.sh,
and conf_sync.sh from dev branch that were missing from production.

Plugin/unraid/api/monitor_remote.php

@@ -0,0 +1,20 @@
+<?php
+header('Content-Type: application/json');
+header('Cache-Control: no-cache, no-store');
+require_once dirname(__DIR__) . '/include/monitor.php';
+
+$cacheFile = '/tmp/vv_cache_monitor_remote.json';
+$cacheTTL  = 3600;
+
+if (!isset($_GET['live']) && file_exists($cacheFile) && (time() - filemtime($cacheFile)) < $cacheTTL) {
+    echo file_get_contents($cacheFile);
+    exit;
+}
+
+$out = json_encode([
+    'remote_hosts' => vv_remote_hosts_stats(),
+    'ts'           => time(),
+]);
+
+file_put_contents($cacheFile, $out);
+echo $out;