feat: analytics frontend dashboard

- Add Dashboard with summary stats, model/user tables
- Add ChartLine component with multi-model support
- Interactive hover tooltips and model breakdown
- Hourly granularity for 24h, daily for 7d+

src/lib/components/admin/Analytics.svelte

@@ -0,0 +1,24 @@
+<script>
+	import { onMount, getContext } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { user } from '$lib/stores';
+
+	import Dashboard from './Analytics/Dashboard.svelte';
+
+	const i18n = getContext('i18n');
+
+	let loaded = false;
+
+	onMount(async () => {
+		if ($user?.role !== 'admin') {
+			await goto('/');
+		}
+		loaded = true;
+	});
+</script>
+
+{#if loaded}
+	<div class="w-full h-full pb-2 px-[16px]">
+		<Dashboard />
+	</div>
+{/if}