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/components/ui/select/SelectSeparator.vue

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+import { cn } from "@/lib/utils";
+import { SelectSeparator, type SelectSeparatorProps } from "radix-vue";
+import { type HTMLAttributes } from "vue";
+
+const props = defineProps<SelectSeparatorProps & { class?: HTMLAttributes["class"] }>();
+</script>
+
+<template>
+    <SelectSeparator :class="cn('-mx-1 my-1 h-px bg-muted', props.class)" />
+</template>