feat: add anonymous view counter with most-read sidebar

- node:sqlite storage in $DATA_DIR/views.db (no native deps)
- POST /api/views/<slug>/ counts once per visitor per 24h via
  daily-salted hash; IPs are never stored, bots are skipped
- GET /api/views/top/ feeds the sidebar's featured list, falling back
  to frontmatter-featured and latest posts when unavailable

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/posts.ts

@@ -59,10 +59,10 @@ export function tagCounts(posts: Post[]): TagCount[] {
   return [...map.values()].sort((a, b) => b.count - a.count || a.tag.localeCompare(b.tag, 'tr'));
 }
 
-/** Fallback "featured" list: frontmatter `featured`, else the latest posts. */
+/** Fallback "featured" list: frontmatter `featured` first, topped up with the latest posts. */
 export function featuredPosts(posts: Post[], limit = 3): Post[] {
   const featured = posts.filter((p) => p.data.featured);
-  return (featured.length ? featured : posts).slice(0, limit);
+  return [...featured, ...posts.filter((p) => !p.data.featured)].slice(0, limit);
 }
 
 /** prev = older post, next = newer post. */