feat: 添加批量删除功能

packages/frontend/src/locales/en-US.json

@@ -140,7 +140,12 @@
       "title": "Batch Edit Connections",
       "editSelected": "Edit Selected",
       "noChange":"No change",
-      "selectedItems":"{count} items selected"
+      "selectedItems":"{count} items selected",
+      "deleteSelectedButton": "Delete Selected",
+      "deleteSelectedTooltip": "Delete selected connections",
+      "confirmMessage": "Are you sure you want to delete the selected {count} connections? This action cannot be undone.",
+      "successMessage": "Selected connections have been successfully deleted.",
+      "errorMessage": "Batch delete connections failed: {error}"
     },
     "actions": {
       "testAllFiltered":"Test All",

packages/frontend/src/locales/ja-JP.json

@@ -118,7 +118,12 @@
             "title": "接続の一括編集",
             "editSelected": "選択した項目を編集",
             "noChange": "変更なし",
-            "selectedItems": "{count} 件選択済み"
+            "selectedItems": "{count} 件選択済み",
+            "deleteSelectedButton": "選択した項目を削除",
+            "deleteSelectedTooltip": "選択した接続を削除します",
+            "confirmMessage": "選択した {count} 件の接続を本当に削除しますか？この操作は元に戻せません。",
+            "successMessage": "選択した接続は正常に削除されました。",
+            "errorMessage": "接続の一括削除に失敗しました: {error}"
         },
         "actions": {
             "testAllFiltered":"すべてテスト",

packages/frontend/src/locales/zh-CN.json

@@ -140,7 +140,11 @@
       "title": "批量编辑连接",
       "selectedItems": "已选项目",
       "noChange": "保持不变",
-      "tagsPlaceholder": "输入标签 (替换现有)"
+      "deleteSelectedButton": "删除选中",
+      "deleteSelectedTooltip": "删除选中的连接",
+      "confirmMessage": "您确定要删除选中的 {count} 个连接吗？此操作无法撤销。",
+      "successMessage": "选中的连接已成功删除。",
+      "errorMessage": "批量删除连接失败: {error}"
     },
     "actions": {
       "testAllFiltered":"测试全部",