Close OSS self-host gaps: in-repo API docs, legal notes, and packaging.

Add MIT license and docs/api, strip SaaS status/admin remnants from robots and footer, align env/compose/README with payment-free product truth.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/LegalPageLayout.tsx

@@ -2,6 +2,7 @@ import Link from "next/link";
 import type { ReactNode } from "react";
 import { Logo } from "@/components/Logo";
 import { LEGAL_LAST_UPDATED } from "@/lib/legal/constants";
+import { DOCS_URL } from "@/lib/plans";
 
 type Props = {
   title: string;
@@ -45,7 +46,7 @@ export function LegalPageLayout({ title, description, children }: Props) {
             Terms
           </Link>
           <a
-            href="https://docs.songs2vid.com"
+            href={DOCS_URL}
             target="_blank"
             rel="noopener noreferrer"
             className="hover:text-gray-300"