feat(v5): add server bootstrap job with realtime cluster broadcasting

- Add V5BootstrapServerJob: SSH into new servers, install coold/WireGuard,
  track bootstrap progress via last_bootstrap_action/status/output fields
- Add V5ClusterUpdated event: broadcasts full cluster+servers payload to
  team private channel on bootstrap state changes
- Add V5RealtimeTestEvent + RealtimeTest page for WebSocket connectivity testing
- Consolidate 3 dropped migrations into base cluster/server migrations:
  WireGuard config, builder CPU quota, status check fields, uuid
- Auto-generate uuid on V5Model create via Schema::hasColumn guard
- Expose currentTeam.id in Inertia shared props
- Add showCluster, realtimeTest, broadcastRealtimeTest controller endpoints
- Add dropdown-menu UI component

resources/css/v5/app.css

@@ -58,6 +58,7 @@
     --radius-2xl: calc(var(--radius) * 1.8);
     --radius-3xl: calc(var(--radius) * 2.2);
     --radius-4xl: calc(var(--radius) * 2.6);
+    --default-ring-color: var(--ring);
 }
 
 :root {
@@ -140,6 +141,11 @@
     ::backdrop,
     ::file-selector-button {
         @apply border-border outline-ring/50;
+        --tw-ring-offset-color: var(--background);
+    }
+
+    :where(a, button, input, select, textarea, [role="button"], [tabindex]:not([tabindex="-1"])):focus-visible {
+        @apply outline-none ring-2 ring-ring ring-offset-2;
     }
 
     html,