Report the partner's API key and whether it is actually answering

Plugin/unraid/include/partnership.php

@@ -498,7 +498,27 @@ function vv_pt_nodes(): array {
                 $apiKeySet     = true;
                 $apiKeyPreview = substr($apiData['key'], 0, 8) . '...' . substr($apiData['key'], -4);
             }
+        } else {
+            // The partner's key is in the partner's own conf, which this host holds in the RAM
+            // cache that conf_sync fills — never on disk here, because sparse checkout means a
+            // host only ever checks out its own host*.conf.
+            //
+            // Two separate facts, deliberately not merged: a key being CONFIGURED is read from
+            // that conf, and the key WORKING is proven by the partner's API having answered this
+            // page's own stats call. A configured key that no longer authenticates would
+            // otherwise render exactly like a healthy one.
+            $pConf = VV_CONF_RAM_CACHE_DIR . '/' . strtolower($nodeIdUpper) . '.conf';
+            if (is_readable($pConf)) {
+                $pKey = vv_arr_scalar((string)@file_get_contents($pConf), $nodeIdUpper . '_UNRAID_API_KEY');
+                if ($pKey !== '') {
+                    $apiKeySet     = true;
+                    $apiKeyPreview = substr($pKey, 0, 8) . '...' . substr($pKey, -4);
+                }
+            }
         }
+        // Did the partner's API actually answer? Empty for self, where the local API has its own
+        // banner on the Monitor tab.
+        $apiLive = !$isMe && !empty(($remoteStats[$nodeIdUpper] ?? [])['available']);
 
         // Live metrics: local uses vv_api_data() (cached); remote uses vv_remote_hosts_stats() (30s cache)
         if ($isMe) {
@@ -549,6 +569,7 @@ function vv_pt_nodes(): array {
             'local_done'      => $localDone,
             'api_key_set'     => $apiKeySet,
             'api_key_preview' => $apiKeyPreview,
+            'api_live'        => $apiLive,
             'metrics'         => $metrics,
             'media_seed'      => $isMe ? [] : vv_pt_media_seed($setupDb, $nodeIdUpper),
             // Every condition that has to hold for this partner to actually be usable, each