Add SEO comparison landing pages and footer compare links.

Introduces dynamic marketing comparison routes, competitor data, and Compare sections on the homepage and marketing footer.

app/(marketing)/[slug]/page.tsx

@@ -0,0 +1,58 @@
+import type { Metadata } from 'next';
+import { notFound } from 'next/navigation';
+import { ComparisonPage } from '@/components/marketing/comparison-page';
+import { auth } from '@/lib/auth';
+import { comparisonPages, getComparisonPage } from '@/lib/marketing/comparison-pages';
+import { buildComparisonJsonLd, buildComparisonMetadata } from '@/lib/marketing/metadata';
+
+interface MarketingSlugPageProps {
+  params: Promise<{ slug: string }>;
+}
+
+export function generateStaticParams() {
+  return comparisonPages.map((page) => ({ slug: page.slug }));
+}
+
+export async function generateMetadata({ params }: MarketingSlugPageProps): Promise<Metadata> {
+  const { slug } = await params;
+  const page = getComparisonPage(slug);
+
+  if (!page) {
+    return {};
+  }
+
+  return buildComparisonMetadata({
+    title: page.title,
+    description: page.metaDescription,
+    path: `/${page.slug}`,
+    keywords: page.keywords,
+  });
+}
+
+export default async function MarketingSlugPage({ params }: MarketingSlugPageProps) {
+  const { slug } = await params;
+  const page = getComparisonPage(slug);
+
+  if (!page) {
+    notFound();
+  }
+
+  const session = await auth();
+  const structuredData = buildComparisonJsonLd({
+    title: page.title,
+    description: page.metaDescription,
+    path: `/${page.slug}`,
+    faq: page.faq,
+  });
+  const safeStructuredData = JSON.stringify(structuredData).replace(/</g, '\\u003c');
+
+  return (
+    <>
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{ __html: safeStructuredData }}
+      />
+      <ComparisonPage page={page} isLoggedIn={Boolean(session?.user)} />
+    </>
+  );
+}