varaverk: add Partner card — known hosts, owner tags, Tailscale online status

Plugin/usr/local/emhttp/plugins/varaverk/include/monitor.php

@@ -249,6 +249,45 @@ function vv_network_stats(): array {
     ];
 }
 
+function vv_partner_state(): array {
+    $vars   = vv_conf_vars();
+    $myName = trim(shell_exec('hostname -s') ?: '');
+
+    // Parse Tailscale peer status once
+    $tsData  = json_decode(shell_exec('tailscale status --json 2>/dev/null') ?: '{}', true) ?? [];
+    $tsPeers = [];
+    foreach ($tsData['Peer'] ?? [] as $peer) {
+        // DNSName is "hostname.tailnet.ts.net." — take the first label (full, not truncated)
+        $dns = $peer['DNSName'] ?? '';
+        $h   = $dns ? strtolower(explode('.', $dns)[0]) : strtolower($peer['HostName'] ?? '');
+        if ($h) $tsPeers[$h] = (bool)($peer['Online'] ?? false);
+    }
+
+    $hosts = [];
+    foreach (['HOST1', 'HOST2', 'HOST3', 'HOST4'] as $id) {
+        $hostname = $vars[$id] ?? '';
+        if (!$hostname) continue;
+        $isMe    = strcasecmp($hostname, $myName) === 0;
+        $isOwner = strcasecmp($id, $vars['PARTNERSHIP_OWNER_HOST'] ?? '') === 0;
+        $online  = $isMe ? true : ($tsPeers[strtolower($hostname)] ?? null);
+        $hosts[] = [
+            'id'       => $id,
+            'hostname' => $hostname,
+            'owner'    => $vars[$id . '_OWNER'] ?? '',
+            'is_me'    => $isMe,
+            'is_owner' => $isOwner,
+            'online'   => $online,
+        ];
+    }
+
+    return [
+        'enabled'    => ($vars['PARTNERSHIP_ENABLED'] ?? 'false') === 'true',
+        'owner_host' => $vars['PARTNERSHIP_OWNER_HOST'] ?? '',
+        'sync_min'   => (int)($vars['PARTNERSHIP_SYNC_INTERVAL'] ?? 15),
+        'hosts'      => $hosts,
+    ];
+}
+
 function vv_fallback_state(): array {
     // State file written by fallback.sh
     $stateFile = '/tmp/fallback_state.db';