feat: install and configure @rmdes/indiekit-endpoint-blogroll

Mounts blogroll API at /blogrollapi — syncs RSS/Atom feeds hourly,
caches 50 items per blog, deletes items after 7 days.
Public endpoints: /blogrollapi/api/blogs, /items, /categories, /status, /opml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

indiekit.config.mjs

@@ -310,6 +310,7 @@ export default {
     "@rmdes/indiekit-endpoint-podroll",
     "@rmdes/indiekit-endpoint-activitypub",
     "@rmdes/indiekit-endpoint-youtube",
+    "@rmdes/indiekit-endpoint-blogroll",
   ],
   "@indiekit/store-github": {
     user: githubUsername,
@@ -424,5 +425,12 @@ export default {
       languages: ["en", "de"],
       checked: false
     },
+    "@rmdes/indiekit-endpoint-blogroll": {
+      mountPath: "/blogrollapi",
+      syncInterval: 3600000,
+      maxItemsPerBlog: 50,
+      maxItemAge: 7,
+      fetchTimeout: 15000,
+    },
 };