feat(frontend): scaffold SvelteKit + Tailwind with landing (part 1)

New SvelteKit app in frontend/ (minimal template, TypeScript, TailwindCSS v4).
Adds the app shell (dark music theme navbar + footer) and a landing page with
hero and feature cards. CTAs point to /login and /explore (built in later parts).

Verified: production build succeeds and the page renders with Tailwind styles
applied (checked via preview).

frontend/src/lib/assets/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="107" height="128" viewBox="0 0 107 128"><title>svelte-logo</title><path d="M94.157 22.819c-10.4-14.885-30.94-19.297-45.792-9.835L22.282 29.608A29.92 29.92 0 0 0 8.764 49.65a31.5 31.5 0 0 0 3.108 20.231 30 30 0 0 0-4.477 11.183 31.9 31.9 0 0 0 5.448 24.116c10.402 14.887 30.942 19.297 45.791 9.835l26.083-16.624A29.92 29.92 0 0 0 98.235 78.35a31.53 31.53 0 0 0-3.105-20.232 30 30 0 0 0 4.474-11.182 31.88 31.88 0 0 0-5.447-24.116" style="fill:#ff3e00"/><path d="M45.817 106.582a20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.503 18 18 0 0 1 .624-2.435l.49-1.498 1.337.981a33.6 33.6 0 0 0 10.203 5.098l.97.294-.09.968a5.85 5.85 0 0 0 1.052 3.878 6.24 6.24 0 0 0 6.695 2.485 5.8 5.8 0 0 0 1.603-.704L69.27 76.28a5.43 5.43 0 0 0 2.45-3.631 5.8 5.8 0 0 0-.987-4.371 6.24 6.24 0 0 0-6.698-2.487 5.7 5.7 0 0 0-1.6.704l-9.953 6.345a19 19 0 0 1-5.296 2.326 20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.502 17.99 17.99 0 0 1 8.13-12.052l26.081-16.623a19 19 0 0 1 5.3-2.329 20.72 20.72 0 0 1 22.237 8.243 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-.624 2.435l-.49 1.498-1.337-.98a33.6 33.6 0 0 0-10.203-5.1l-.97-.294.09-.968a5.86 5.86 0 0 0-1.052-3.878 6.24 6.24 0 0 0-6.696-2.485 5.8 5.8 0 0 0-1.602.704L37.73 51.72a5.42 5.42 0 0 0-2.449 3.63 5.79 5.79 0 0 0 .986 4.372 6.24 6.24 0 0 0 6.698 2.486 5.8 5.8 0 0 0 1.602-.704l9.952-6.342a19 19 0 0 1 5.295-2.328 20.72 20.72 0 0 1 22.237 8.242 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-8.13 12.053l-26.081 16.622a19 19 0 0 1-5.3 2.328" style="fill:#fff"/></svg>

frontend/src/lib/components/Footer.svelte

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+<footer class="border-t border-white/5 py-8">
+	<div
+		class="mx-auto flex max-w-6xl flex-col items-center justify-between gap-4 px-6 text-sm text-neutral-500 sm:flex-row"
+	>
+		<p>© {new Date().getFullYear()} Musify · Streaming de música.</p>
+		<div class="flex gap-6">
+			<a href="/explore" class="transition hover:text-neutral-300">Explorar</a>
+			<a href="/login" class="transition hover:text-neutral-300">Entrar</a>
+		</div>
+	</div>
+</footer>

frontend/src/lib/components/Navbar.svelte

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+<script lang="ts">
+	const links = [
+		{ href: '/', label: 'Inicio' },
+		{ href: '/explore', label: 'Explorar' }
+	];
+</script>
+
+<header class="sticky top-0 z-50 border-b border-white/5 bg-neutral-950/80 backdrop-blur">
+	<nav class="mx-auto flex max-w-6xl items-center justify-between px-6 py-4">
+		<a href="/" class="flex items-center gap-2 text-lg font-bold tracking-tight">
+			<span class="grid h-8 w-8 place-items-center rounded-lg bg-emerald-500 text-neutral-950">♪</span>
+			Musify
+		</a>
+
+		<div class="hidden items-center gap-8 md:flex">
+			{#each links as link (link.href)}
+				<a href={link.href} class="text-sm text-neutral-300 transition hover:text-white">{link.label}</a>
+			{/each}
+		</div>
+
+		<div class="flex items-center gap-3">
+			<a href="/login" class="text-sm font-medium text-neutral-300 transition hover:text-white">
+				Iniciar sesión
+			</a>
+			<a
+				href="/login"
+				class="rounded-full bg-emerald-500 px-4 py-2 text-sm font-semibold text-neutral-950 transition hover:bg-emerald-400"
+			>
+				Registrarse
+			</a>
+		</div>
+	</nav>
+</header>

frontend/src/lib/index.ts

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+// place files you want to import through the `$lib` alias in this folder.