feat(about-history):修复发展历史详情页样式

public/themes/dist_static/static/css/about-history.css

@@ -1,7 +1,27 @@
 .main-about-history {
   --ah-sticky-top: calc(var(--header-h) + 5rem);
-  background: var(--color-white);
+  position: relative;
   min-height: 10vh;
+  background-color: var(--color-white);
+}
+
+/* Lenis 下 background-attachment:fixed 无效，用固定层保证背景不随滚动移动 */
+.main-about-history::before {
+  content: "";
+  position: fixed;
+  inset: 0;
+  z-index: 0;
+  pointer-events: none;
+  background-color: var(--color-white);
+  background-image: url("../images/about-history.jpg");
+  background-size: cover;
+  background-position: center;
+  background-repeat: no-repeat;
+}
+
+.main-about-history > * {
+  position: relative;
+  z-index: 1;
 }
 
 .ah-page {
@@ -153,7 +173,15 @@
   margin: 0 0 1.5rem;
   padding-left: 1.25rem;
 }
-
+.ah-richtext ul {
+  list-style-type: disc;
+}
+.ah-richtext ol {
+  list-style-type: decimal;
+}
+.ah-richtext li {
+  list-style: inherit;
+}
 .ah-richtext li + li {
   margin-top: 0.75rem;
 }