refactor(frontend): 优化布局组件

- 改进 CardSection 和 Section 组件
- 优化布局结构和样式

frontend/src/components/layout/CardSection.vue

@@ -52,6 +52,8 @@ interface Props {
 }
 
 const props = withDefaults(defineProps<Props>(), {
+  title: undefined,
+  description: undefined,
   variant: 'default',
   padding: 'md',
 })

frontend/src/components/layout/Section.vue

@@ -41,6 +41,8 @@ interface Props {
 }
 
 const props = withDefaults(defineProps<Props>(), {
+  title: undefined,
+  description: undefined,
   spacing: 'md',
 })