fix(widgets): restore hot-posts rank badge position per reference

Remove unscoped .img-badge top/left overrides from post-card.css and its
build aggregates that hijacked the reference-parity rules in main.css
(top:.6em / .hot-posts left:-15px). Also drop dead .widget-hot-posts
legacy blocks with no remaining markup references.

assets/css/frontend/post-card.css

@@ -471,15 +471,9 @@
   width: calc(33.333% - 11px) !important;
 }
 
-.img-badge {
-  position: absolute;
-  top: 8px;
-  z-index: 2;
-}
-
-.img-badge.left {
-  left: 8px;
-}
+/* img-badge 定位由 main.css 的参考主题规则拥有（.img-badge top:.6em /
+ * .img-badge.left left:0 / .hot-posts .img-badge left:-15px）。
+ * 此前这里存在 top:8px/left:8px 的全局覆盖，导致热榜 TOP 徽章与参考主题错位。 */
 
 @media (min-width: 992px) {
   .fluid-widget-wrap .posts-item.card,