feat(dev): add coold VM dev workflow

Add scripts and Lima config for managing local coold endpoint VMs,
mint Flux dev host JWTs, expose coold host details on the V5 home
page, and document the local development workflow.

app/Http/Controllers/V5/HomeController.php

@@ -21,6 +21,7 @@ class HomeController extends Controller
         return Inertia::render('Home', [
             'status' => 'v5-ready',
             'flux' => $fluxHealth->check(),
+            'cooldHosts' => $this->cooldHosts(),
             'currentTeam' => $currentTeam instanceof Team ? [
                 'id' => $currentTeam->id,
                 'name' => $currentTeam->name,
@@ -41,4 +42,29 @@ class HomeController extends Controller
                 ]),
         ]);
     }
+
+    /**
+     * @return array<int, array{id: string, wireguardIp: string|null, capabilities: array<int, string>, builderEnabled: bool, builderCapacity: int}>
+     */
+    private function cooldHosts(): array
+    {
+        $baseId = (string) config('coold.dev_host_id');
+        $count = max(0, (int) config('coold.dev_host_count'));
+        $builderCapacity = (int) config('coold.dev_builder_capacity');
+        $builderEnabled = $builderCapacity > 0;
+
+        if ($count === 0 || $baseId === '') {
+            return [];
+        }
+
+        return collect(range(1, $count))
+            ->map(fn (int $index) => [
+                'id' => $index === 1 ? $baseId : (string) config("coold.dev_host_id_{$index}", "{$baseId}-{$index}"),
+                'wireguardIp' => (string) config("coold.dev_wireguard_ip_{$index}") ?: null,
+                'capabilities' => $builderEnabled ? ['coold', 'builder'] : ['coold'],
+                'builderEnabled' => $builderEnabled,
+                'builderCapacity' => $builderCapacity,
+            ])
+            ->all();
+    }
 }