feat: clientarea 布局重构 — 顶栏全宽独占一行

HTML 结构变更 (20个PHP文件):
- 旧: el-container > [aside-menu, el-container > [top-menu, el-main]]
- 新: el-container[direction=vertical] > [top-menu, el-container > [aside-menu, el-main]]

CSS 适配:
- el-header: sticky top:0, z-index:100, width:100%
- el-aside: height calc(100vh-60px), sticky top:60px

clientarea/hgcloud/css/dark-override.css

@@ -29,6 +29,9 @@ html, body {
 .el-aside {
   background: #FFFFFF !important;
   border-right: 1px solid rgba(0,0,0,0.06);
+  height: calc(100vh - 60px) !important;
+  position: sticky !important;
+  top: 60px !important;
 }
 
 .ali-logo {
@@ -111,6 +114,10 @@ html, body {
   backdrop-filter: none !important;
   box-shadow: 0 1px 0 rgba(0,0,0,0.06) !important;
   border-bottom: 1px solid rgba(0,0,0,0.06);
+  position: sticky !important;
+  top: 0 !important;
+  z-index: 100 !important;
+  width: 100% !important;
 }
 
 .el-header .search-value,