Restructure UX and seed a fully simulated organisation

Rework the dashboard, environment topology view, header navigation, and
status rendering, and standardise selects on a shadcn-vue component.

Replace the thin database seeder with a SimulatedEnvironmentSeeder that
builds a fully wired, mostly-running organisation (ACTIVE server fleet,
managed + GHCR registries, Gitea source provider, ClipBin app with
production/staging environments, services, slices, endpoints, managed
variables, build artifacts, and a completed/in-progress/failed operations
history) so the new UI renders against realistic data.

resources/js/pages/applications/Index.vue

@@ -45,11 +45,7 @@ defineProps<{
             </div>
         </div>
         <div class="grid gap-4 rounded-xl p-4 md:grid-cols-2 lg:grid-cols-3">
-            <Card
-                v-for="application in applications"
-                :key="application.id"
-                class="relative w-full"
-            >
+            <Card v-for="application in applications" :key="application.id" class="relative w-full">
                 <CardHeader>
                     <CardTitle>{{ application.name }}</CardTitle>
                     <CardDescription