优化返回顶部图标，增加翻译

apps/jingrow/frontend/src/app/layouts/BackToTop.vue

@@ -218,7 +218,7 @@ onUnmounted(() => {
 <style scoped>
 .back-to-top-btn {
   position: fixed;
-  right: 24px;
+  right: 32px;
   bottom: 24px;
   z-index: 1000;
   width: 48px;
@@ -272,7 +272,7 @@ onUnmounted(() => {
 /* 移动端调整位置 */
 @media (max-width: 768px) {
   .back-to-top-btn {
-    right: 16px;
+    right: 20px;
     bottom: 16px;
     width: 48px;
     height: 48px;

apps/jingrow/frontend/src/locales/zh-CN.json

@@ -257,6 +257,7 @@
 
   "View and manage agent settings": "查看和管理智能体配置",
   "Back": "返回",
+  "Back to top": "返回顶部",
   "Detail": "详情",
   "Basic Information": "基本信息",
   "Enabled": "已启用",