feat: add API link to site footer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: dani-polani

bitext/src/lib/components/layout/SiteFooter.svelte

@@ -21,6 +21,8 @@
 	<p class="m-0">
 		<a href={resolve('/')} class={linkClass}>Open {ALIGNER_DISPLAY_NAME}</a>
 		<span class="mx-2 text-gray-400 dark:text-gray-600" aria-hidden="true">·</span>
+		<a href={resolve('/api')} class={linkClass}>API</a>
+		<span class="mx-2 text-gray-400 dark:text-gray-600" aria-hidden="true">·</span>
 		<a href={resolve('/privacy')} class={linkClass}>Privacy policy</a>
 	</p>
 	<p class="mx-auto mt-5 max-w-md text-base leading-relaxed text-gray-700 dark:text-gray-300">