Integrate Prisma for content; enhance SEO, i18n, and deployment workflows

Co-authored-by: dennis <dennis@konkol.net>

app/robots.txt/route.ts

@@ -0,0 +1,25 @@
+import { NextResponse } from "next/server";
+import { getBaseUrl } from "@/lib/seo";
+
+export const dynamic = "force-dynamic";
+
+export async function GET() {
+  const base = getBaseUrl();
+  const body = [
+    "User-agent: *",
+    "Allow: /",
+    "Disallow: /api/",
+    "Disallow: /manage",
+    "Disallow: /editor",
+    `Sitemap: ${base}/sitemap.xml`,
+    "",
+  ].join("\n");
+
+  return new NextResponse(body, {
+    headers: {
+      "Content-Type": "text/plain; charset=utf-8",
+      "Cache-Control": "public, max-age=3600",
+    },
+  });
+}
+