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.

database/seeders/TestEnvironmentSeeder.php

@@ -30,7 +30,7 @@ class TestEnvironmentSeeder extends Seeder
         $organisation->providers()->create([
             'name' => 'Hetzner',
             'type' => ProviderType::HETZNER,
-            'token' => env('HETZNER_KEY'),
+            'token' => env('HETZNER_KEY') ?: 'local-placeholder-token',
         ]);
     }
 }