fix: 移除账户管理页面的横向滚动条

- 移除 .table-container 的 overflow-x: auto 样式
- 清理重复的样式定义
- 修复账户管理页面在某些情况下出现不必要横向滚动条的问题

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Co-Authored-By: Claude <noreply@anthropic.com>

web/admin-spa/src/views/AccountsView.vue

@@ -3798,7 +3798,6 @@ onMounted(() => {
 
 <style scoped>
 .table-container {
-  overflow-x: auto;
   border-radius: 12px;
   border: 1px solid rgba(0, 0, 0, 0.05);
 }
@@ -3832,12 +3831,6 @@ onMounted(() => {
   min-height: calc(100vh - 300px);
 }
 
-.table-container {
-  overflow-x: auto;
-  border-radius: 12px;
-  border: 1px solid rgba(0, 0, 0, 0.05);
-}
-
 .table-row {
   transition: all 0.2s ease;
 }