fix: 顶栏全宽 + 内容区背景色 + 等高

- el-header: width:100% 覆盖旧的 calc(100%-190px), height:60px
- el-header: position:relative 覆盖旧的 position:fixed
- el-main: background-color:#F5F7FA
- el-aside/el-main: min-height:0 确保 grid 等高

clientarea/hgcloud/css/dark-override.css

@@ -49,24 +49,30 @@ html, body {
 .el-header {
   grid-column: 1 / -1 !important;
   grid-row: 1 !important;
+  width: 100% !important;
+  height: 60px !important;
+  position: relative !important;
   background: #FFFFFF !important;
   box-shadow: 0 1px 0 rgba(0,0,0,0.06) !important;
   border-bottom: 1px solid rgba(0,0,0,0.06);
   z-index: 100 !important;
-  position: sticky !important;
-  top: 0 !important;
+  display: flex !important;
+  align-items: center !important;
 }
 
-/* el-aside: 第一列, 第二行 */
+/* el-aside: 第一列, 第二行, 背景撑满 */
 .template > .el-container > .el-aside {
   grid-column: 1 !important;
   grid-row: 2 !important;
+  min-height: 0 !important;
 }
 
-/* el-main: 第二列, 第二行 */
+/* el-main: 第二列, 第二行, 背景色 */
 .el-main {
   grid-column: 2 !important;
   grid-row: 2 !important;
+  background-color: #F5F7FA !important;
+  min-height: 0 !important;
 }
 
 /* ============ 顶栏 Logo ============ */