feat: categories — pages, nav, home block, admin editor select

lib/engine.js

@@ -19,9 +19,20 @@ async function call(path, options = {}) {
   return res.json();
 }
 
-export async function listArticles({ limit = 20, offset = 0, tag } = {}) {
+export async function listCategories() {
+  try { return await call('/api/categories', { next: { revalidate: 3600 } }); }
+  catch { return []; }
+}
+
+export async function getCategoryArticles(slug, { limit = 20, offset = 0 } = {}) {
+  try { return await call(`/api/categories/${slug}/articles?limit=${limit}&offset=${offset}`); }
+  catch { return []; }
+}
+
+export async function listArticles({ limit = 20, offset = 0, tag, category } = {}) {
   const params = new URLSearchParams({ limit, offset });
   if (tag) params.set('tag', tag);
+  if (category) params.set('category', category);
   return call(`/api/articles?${params}`, { next: { revalidate: 60 } });
 }