feat(user): badge icon urls and wear medal chrome

Extend badge dictionary with optional icon_url, prefer aksrt_wear_badge
when assigned, and render medal images in identity chips.

assets/css/frontend/single-post/cover.css

@@ -285,6 +285,14 @@
   line-height: 1.2;
   vertical-align: middle;
 }
+.article-avatar .medal-icon.img-icon,
+.article-avatar .aksrt-identity-medal {
+  width: 1.4em;
+  height: 1.4em;
+  object-fit: contain;
+  vertical-align: middle;
+  margin-left: 4px;
+}
 .article-avatar .display-name {
   margin-right: 2px;
 }