feat(i18n): add multi-language support (ja/ko/vi/ru/zh-TW) with system auto-detection

- Extend AppLanguage to 7 locales: zh-CN, zh-TW, en, ja, ko, vi, ru
- Auto-detect system language via navigator.languages; fallback to English
- Add BCP47 locale mapping for date formatting and sorting
- Create 50 translation JSON files (5 languages × 10 namespaces, 1137 keys each)
- Update language selector with native language names
- Extend locale key parity test to cover all 7 languages (70 assertions)
- Add VNC/RDP desktop, serial terminal, AI agent, port forwarding, and SFTP features
- Add credential encryption, host metrics, session backup crypto, and zmodem bridge
- Update Rust backend: desktop services, host metrics, SSH/SFTP enhancements

test/setup.ts

@@ -4,8 +4,16 @@
 
 import '@testing-library/jest-dom'
 import { vi } from 'vitest'
+import i18n from '../src/i18n'
+import { useSettingsStore } from '../src/stores/settingsStore'
 import type { DesktopApiContract } from '../src/desktop'
 
+void i18n.changeLanguage('zh-CN')
+useSettingsStore.setState((state) => ({
+  settings: { ...state.settings, language: 'zh-CN' },
+  isLoaded: state.isLoaded,
+}))
+
 // Mock native desktop API
 export const mockDesktopApi: DesktopApiContract = {
   takePendingSshLinks: vi.fn().mockResolvedValue([]),
@@ -16,14 +24,17 @@ export const mockDesktopApi: DesktopApiContract = {
     nativeBackend: 'Tauri 2 / Rust',
     sshBackend: 'libssh2 / ssh2 0.9',
     dataPath: '/tmp/opsxshell-data.json',
-    credentialPath: '/tmp/.opsxshsell/master.key',
+    credentialPath: '/tmp/.opsxshell/master.key',
   }),
   // SSH
   sshConnect: vi.fn().mockResolvedValue({ success: true, connectionId: 'test-conn-1' }),
   sshDisconnect: vi.fn().mockResolvedValue({ success: true }),
   sshExec: vi.fn().mockResolvedValue({ success: true, result: '', exitCode: 0 }),
+  sshExecCancel: vi.fn().mockResolvedValue({ success: true }),
+  sshHostMetrics: vi.fn().mockResolvedValue({ success: true, metrics: { disks: [] } }),
   sshKeepalive: vi.fn().mockResolvedValue({ success: true }),
   sshCreateShell: vi.fn().mockResolvedValue({ success: true, shellId: 'test-shell-1' }),
+  sshShellOpenOutput: vi.fn().mockResolvedValue({ success: true, data: [] }),
   sshShellWrite: vi.fn().mockResolvedValue({ success: true }),
   sshShellResize: vi.fn().mockResolvedValue({ success: true }),
   sshCloseShell: vi.fn().mockResolvedValue({ success: true }),
@@ -37,7 +48,9 @@ export const mockDesktopApi: DesktopApiContract = {
   sftpConnect: vi.fn().mockResolvedValue({ success: true, sftpId: 'test-sftp-1' }),
   sftpListDirectory: vi.fn().mockResolvedValue({ success: true, files: [] }),
   sftpUpload: vi.fn().mockResolvedValue({ success: true }),
+  sftpUploadDir: vi.fn().mockResolvedValue({ success: true }),
   sftpDownload: vi.fn().mockResolvedValue({ success: true }),
+  sftpDownloadDir: vi.fn().mockResolvedValue({ success: true }),
   sftpRename: vi.fn().mockResolvedValue({ success: true }),
   sftpDelete: vi.fn().mockResolvedValue({ success: true }),
   sftpMkdir: vi.fn().mockResolvedValue({ success: true }),
@@ -106,6 +119,7 @@ export const mockDesktopApi: DesktopApiContract = {
   localMkdir: vi.fn().mockResolvedValue({ success: true }),
   getHomePath: vi.fn().mockResolvedValue({ success: true, path: '/Users/test' }),
   getDownloadsPath: vi.fn().mockResolvedValue('/Users/test/Downloads'),
+  openDownloadsFolder: vi.fn().mockResolvedValue(undefined),
 
   // App
   getVersion: vi.fn().mockResolvedValue('1.0.0'),
@@ -132,6 +146,7 @@ export const mockDesktopApi: DesktopApiContract = {
   localResize: vi.fn().mockResolvedValue({ success: true }),
   localKill: vi.fn().mockResolvedValue({ success: true }),
   onLocalData: vi.fn(),
+  onLocalExit: vi.fn(),
 
   // Event listeners
   onShellData: vi.fn(),