修复核心UI文本的i18n问题：支持多语言切换

主要修复：
- 右键菜单：在此处打开终端、运行、保存到系统
- 拖拽提示：拖拽系统文件到此处上传、拖拽文件到窗口外下载
- 终端窗口标题和状态提示
- 错误消息：没有选择主机、只能运行可执行文件
- 添加完整的中英文翻译条目

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/locales/zh/translation.json

@@ -705,6 +705,18 @@
     "confirmDeleteMessage": "确定要删除 <strong>{{name}}</strong> 吗？",
     "deleteDirectoryWarning": "这将删除文件夹及其所有内容。",
     "actionCannotBeUndone": "此操作无法撤销。",
+    "dragSystemFilesToUpload": "拖拽系统文件到此处上传",
+    "dragFilesToWindowToDownload": "拖拽文件到窗口外下载",
+    "openTerminalHere": "在此处打开终端",
+    "run": "运行",
+    "saveToSystem": "保存到系统",
+    "selectLocationToSave": "选择位置保存",
+    "openTerminalInFolder": "在此文件夹打开终端",
+    "openTerminalInFileLocation": "在文件位置打开终端",
+    "terminalWithPath": "终端 - {{host}}:{{path}}",
+    "runningFile": "运行 - {{file}}",
+    "onlyRunExecutableFiles": "只能运行可执行文件",
+    "noHostSelected": "没有选择主机",
     "recent": "最近的",
     "pinned": "固定的",
     "folderShortcuts": "文件夹快捷方式",