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.

app/robots.ts

@@ -1,12 +1,17 @@
 import type { MetadataRoute } from "next";
 
+function siteUrl() {
+  const raw = process.env.NEXTAUTH_URL?.trim() || "http://localhost:3000";
+  return raw.replace(/\/$/, "");
+}
+
 export default function robots(): MetadataRoute.Robots {
   return {
     rules: {
       userAgent: "*",
       allow: "/",
-      disallow: ["/admin", "/api/admin"],
+      disallow: ["/api/", "/dashboard", "/jobs"],
     },
-    sitemap: "https://songs2vid.com/sitemap.xml",
+    sitemap: `${siteUrl()}/sitemap.xml`,
   };
 }