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/components/BatchSessionOperations.test.tsx

@@ -4,6 +4,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 import Sidebar from '../../src/components/layout/Sidebar'
 import { useSessionStore, type Session } from '../../src/stores/sessionStore'
 import { useTabStore } from '../../src/stores/tabStore'
+import { unlockProForTests } from '../helpers/entitlement'
 import { mockDesktopApi } from '../setup'
 
 const sessions: Session[] = [
@@ -14,6 +15,7 @@ const sessions: Session[] = [
 describe('batch session operations', () => {
   beforeEach(() => {
     vi.clearAllMocks()
+    unlockProForTests()
     window.opsxApi = mockDesktopApi
     vi.mocked(mockDesktopApi.sessionGetAll).mockResolvedValueOnce({ success: true, sessions })
     useSessionStore.setState({ sessions: [] })
@@ -23,7 +25,7 @@ describe('batch session operations', () => {
     })
   })
 
-  it('selects multiple saved sessions and opens connected terminal tabs', async () => {
+  it('selects multiple saved sessions and opens batch exec', async () => {
     const user = userEvent.setup()
     render(
       <Sidebar
@@ -38,13 +40,20 @@ describe('batch session operations', () => {
     await user.click(screen.getByText('Prod A'))
     await user.click(screen.getByText('Prod B'))
 
-    expect(screen.getByText('已选 2 个会话')).toBeVisible()
-    await user.click(screen.getByRole('button', { name: /打开终端/ }))
+    expect(screen.getByText(/已选 2 个 SSH/)).toBeVisible()
+    expect(screen.queryByRole('button', { name: /打开终端/ })).not.toBeInTheDocument()
+    expect(screen.queryByRole('button', { name: /打开 SFTP/ })).not.toBeInTheDocument()
 
-    expect(useTabStore.getState().tabs).toEqual(expect.arrayContaining([
-      expect.objectContaining({ sessionId: 'prod-a', type: 'terminal', connectOnMount: true }),
-      expect.objectContaining({ sessionId: 'prod-b', type: 'terminal', connectOnMount: true }),
-    ]))
+    await user.click(screen.getByRole('button', { name: '批量执行' }))
+
+    expect(useTabStore.getState().tabs).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          type: 'batch',
+          batchSessionIds: ['prod-a', 'prod-b'],
+        }),
+      ])
+    )
   })
 
   it('opens SFTP only from the saved session context menu', async () => {
@@ -59,10 +68,10 @@ describe('batch session operations', () => {
 
     const sessionName = await screen.findByText('Prod A')
     expect(screen.queryByTitle('SFTP')).not.toBeInTheDocument()
-    expect(screen.queryByText('SFTP 文件')).not.toBeInTheDocument()
+    expect(screen.queryByText('SFTP')).not.toBeInTheDocument()
 
     fireEvent.contextMenu(sessionName)
-    await user.click(screen.getByRole('button', { name: 'SFTP 文件' }))
+    await user.click(screen.getByRole('button', { name: 'SFTP' }))
 
     expect(useTabStore.getState().tabs).toEqual(expect.arrayContaining([
       expect.objectContaining({ sessionId: 'prod-a', type: 'sftp' }),