fix(destinations): handle empty and server-scoped destinations

Build the global destinations list from actual destination records so empty
servers do not render duplicate empty states. Allow creating Docker destinations
for a selected team server outside the global usable list, authorize swarm
creation correctly, and store discovered swarm network names from the selected
network. Add feature coverage for empty states, selected-server mounting, and
swarm destination creation.

app/Livewire/Server/Destinations.php

@@ -45,7 +45,7 @@ class Destinations extends Component
             } else {
                 SwarmDocker::create([
                     'name' => $this->server->name.'-'.$name,
-                    'network' => $this->name,
+                    'network' => $name,
                     'server_id' => $this->server->id,
                 ]);
             }