fix: profile import file upload, startup health check, sidebar scroll, node-pty fallback

- Change profile import from server path input to browser file upload (multipart)
- Fix startup script to wait for health check before opening browser
- Add overflow scroll with hidden scrollbar to sidebar nav
- Graceful degradation when node-pty fails to load (WSL compatibility)
- Remove rename button from profile cards
- Restrict profile name input to English letters, numbers, hyphens
- Use raw.githubusercontent.com URLs in README setup script

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/i18n/locales/zh.ts

@@ -232,8 +232,10 @@ export default {
     exportFailed: '导出配置失败',
     importSuccess: '配置已导入',
     importFailed: '导入配置失败',
+    importSelectFile: '选择归档文件',
+    importInvalidFile: '请选择有效的归档文件 (.tar.gz, .tgz, .gz, .zip)',
     name: '配置名称',
-    namePlaceholder: '输入配置名称',
+    namePlaceholder: '仅限英文、数字、连字符',
     newName: '新名称',
     newNamePlaceholder: '输入新名称',
     cloneFromCurrent: '从当前配置克隆',