finish packaging $lib; add validate, backroom packages

src/lib/InjectUmami.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import { dev } from '$app/environment';
+
+	let { websiteID }: { websiteID: string } = $props();
+
+	if (dev) console.log('[dev]: Umami tracking disabled');
+</script>
+
+<svelte:head>
+	{#if !dev}
+		<script defer src="https://sand.auvem.com/script.js" data-website-id={websiteID}></script>
+	{:else}
+		<script>
+			window.umami = {
+				track: (...args) => console.log('[dev]: Track called with:', ...args)
+			};
+		</script>
+	{/if}
+</svelte:head>