fix(user-center): restore page-owned dual-column sidebar layout

User center left nav (stats/services/commerce) stacked or hid after
content-layout lost its grid and the site float shell treated the
nested .sidebar as a widget column. Scope a CSS grid under
body.aksrt-user-center, neutralize site-layout float/hide, align the
drawer to ≤991.98, and drop the truncated #panel-credits selector.

assets/css/routes/user-center/shell.css

@@ -25,6 +25,64 @@
   padding: 0 0 40px;
 }
 
+/* ==================== 页面自有双栏（page-owned，非全站 float 壳） ==================== */
+/* DOM: content first + aside second；桌面用 grid-area 把 aside 放左侧。 */
+body.aksrt-user-center .aksrt-profile__layout {
+  display: block;
+  width: 100%;
+  margin-left: 0;
+  margin-right: 0;
+  min-width: 0;
+}
+
+/* 中和 site-layout-2/3 对 content-layout 的 margin 挖空 */
+body.aksrt-user-center.site-layout-1 .aksrt-profile__layout,
+body.aksrt-user-center.site-layout-2 .aksrt-profile__layout,
+body.aksrt-user-center.site-layout-3 .aksrt-profile__layout {
+  margin-left: 0;
+  margin-right: 0;
+}
+
+/* 私有导航：中和 body.site-layout-1 .sidebar { display:none } 与 float 几何 */
+body.aksrt-user-center .sidebar.page-owned.uc-sidebar {
+  float: none;
+  width: auto;
+  margin-left: 0;
+  margin-right: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  box-sizing: border-box;
+  min-width: 0;
+}
+
+@media (min-width: 992px) {
+  body.aksrt-user-center .aksrt-profile__layout {
+    display: grid;
+    grid-template-columns: var(--sidebar-width, 311px) minmax(0, 1fr);
+    grid-template-areas: "aside primary";
+    gap: 20px;
+    align-items: start;
+  }
+
+  body.aksrt-user-center .aksrt-profile__layout > .uc-content,
+  body.aksrt-user-center .aksrt-profile__layout > .content-layout__primary {
+    grid-area: primary;
+    min-width: 0;
+    width: auto;
+  }
+
+  body.aksrt-user-center .aksrt-profile__layout > .uc-sidebar,
+  body.aksrt-user-center .aksrt-profile__layout > .aksrt-profile__aside {
+    grid-area: aside;
+  }
+
+  body.aksrt-user-center .sidebar.page-owned.uc-sidebar {
+    position: sticky;
+    top: calc(var(--nav-height, 60px) + 20px);
+  }
+}
+
 .uc-header__actions {
   position: relative;
 }
@@ -45,9 +103,8 @@
   line-height: 1;
 }
 /* ==================== 左侧边栏 ==================== */
+/* sticky / 双栏位置由 body.aksrt-user-center .sidebar.page-owned 负责；此处只定 chrome 布局 */
 .uc-sidebar {
-  position: sticky;
-  top: 80px;
   display: flex;
   flex-direction: column;
   gap: 12px;
@@ -304,5 +361,3 @@
   padding-top: 18px;
   border-top: 1px solid var(--color-line-soft, rgba(0,0,0,0.06));
 }
-
-.uc-content #panel-credits