Graceful degradation before partnership/SSH is set up

Fix 1 — Monitor partner card (common.php + monitor.php):
  vv_remote_hosts_stats() no longer skips hosts with no API key.
  Returns no_api_key:true entry instead. Monitor JS renders
  "API key not configured — complete Onboard to enable" instead
  of a blank space.

Fix 2 — rawconf push not alarming pre-onboard (config.php + scheduler.php):
  Probe failures (Tailscale not found, plugin not installed) now carry
  ready:false. JS treats ready:false results silently — button shows
  "✓ Saved" not "push failed: HOST2" before SSH is set up.
  Only genuine post-onboard failures (ready not false) show as errors.

Fix 3 — Partnership Onboard button (partnership.php):
  Disabled with tooltip when no partner hostname is in master.conf.
  When partner configured but not onboarded, adds explanation note:
  "Onboard will generate your SSH key, exchange it with the partner..."
  No partner configured: "Edit master.conf and set HOST2."

Plugin/unraid/include/common.php

@@ -572,7 +572,11 @@ function vv_remote_hosts_stats(): array {
     foreach ($hostIds as $id) {
         if (strtolower($id) === strtolower($myHost)) continue;
         $key = $vars[strtoupper($id) . '_UNRAID_API_KEY'] ?? '';
-        if (!$key) continue;
+        if (!$key) {
+            $results[$id] = ['available' => false, 'no_api_key' => true,
+                             'host_id' => $id, 'hostname' => $vars[$id]];
+            continue;
+        }
 
         $cacheFile = "/tmp/vv_remote_{$id}.json";
         if (file_exists($cacheFile) && (time() - filemtime($cacheFile)) < 30) {

Plugin/unraid/include/config.php

@@ -84,7 +84,7 @@ function vv_push_master_conf(): array {
         $hostname = trim($m[2][$i]);
         $ip = vv_resolve_tailscale_ip($hostname);
         if (!$ip) {
-            $results[] = ['host' => $hostKey, 'ok' => false, 'error' => 'Tailscale IP not found'];
+            $results[] = ['host' => $hostKey, 'ok' => false, 'ready' => false, 'error' => 'Tailscale IP not found'];
             continue;
         }
 
@@ -102,7 +102,7 @@ function vv_push_master_conf(): array {
         ) ?: '');
 
         if ($probe === '') {
-            $results[] = ['host' => $hostKey, 'ok' => false,
+            $results[] = ['host' => $hostKey, 'ok' => false, 'ready' => false,
                           'error' => 'plugin not installed, dir missing, or master.conf absent — skipped'];
             continue;
         }