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/sitemap.ts

@@ -1,4 +1,5 @@
 import type { MetadataRoute } from 'next';
+import { comparisonPages } from '@/lib/marketing/comparison-pages';
 import { seoConfig } from '@/lib/seo';
 
 export default function sitemap(): MetadataRoute.Sitemap {
@@ -11,6 +12,12 @@ export default function sitemap(): MetadataRoute.Sitemap {
       changeFrequency: 'daily',
       priority: 1,
     },
+    ...comparisonPages.map((page) => ({
+      url: `${seoConfig.url}/${page.slug}`,
+      lastModified,
+      changeFrequency: 'monthly' as const,
+      priority: 0.8,
+    })),
     {
       url: `${seoConfig.url}/login`,
       lastModified,
@@ -23,5 +30,23 @@ export default function sitemap(): MetadataRoute.Sitemap {
       changeFrequency: 'monthly',
       priority: 0.7,
     },
+    {
+      url: `${seoConfig.url}/terms`,
+      lastModified,
+      changeFrequency: 'yearly',
+      priority: 0.3,
+    },
+    {
+      url: `${seoConfig.url}/privacy`,
+      lastModified,
+      changeFrequency: 'yearly',
+      priority: 0.3,
+    },
+    {
+      url: `${seoConfig.url}/refund`,
+      lastModified,
+      changeFrequency: 'yearly',
+      priority: 0.3,
+    },
   ];
 }