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/utils/hostDistro.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it } from 'vitest'
+import { normalizeDistroId, parseOsPrettyName, parseOsReleaseOrUname, resolveSessionDistro } from '../../src/utils/hostDistro'
+
+describe('hostDistro', () => {
+  it('normalizes common distro ids', () => {
+    expect(normalizeDistroId('ubuntu')).toBe('ubuntu')
+    expect(normalizeDistroId('deepin')).toBe('deepin')
+    expect(normalizeDistroId('uos')).toBe('deepin')
+    expect(normalizeDistroId('rocky')).toBe('rocky')
+    expect(normalizeDistroId('rhel')).toBe('redhat')
+    expect(normalizeDistroId('openEuler')).toBe('openeuler')
+    expect(normalizeDistroId('anolis')).toBe('anolis')
+    expect(normalizeDistroId('alinux')).toBe('alinux')
+    expect(normalizeDistroId('amzn2')).toBe('amazon')
+    expect(normalizeDistroId('Amazon Linux')).toBe('amazon')
+    expect(normalizeDistroId('Alibaba Cloud Linux')).toBe('alinux')
+    expect(normalizeDistroId('Linux')).toBe('linux')
+  })
+
+  it('parses cloud linux from os-release NAME when needed', () => {
+    expect(
+      parseOsReleaseOrUname(`NAME="Alibaba Cloud Linux"
+ID=alinux
+VERSION_ID="3"`)
+    ).toBe('alinux')
+    expect(
+      parseOsReleaseOrUname(`NAME="Amazon Linux"
+ID=amzn
+VERSION_ID="2023"`)
+    ).toBe('amazon')
+  })
+
+  it('parses os-release ID', () => {
+    const sample = `NAME="Ubuntu"
+VERSION="22.04"
+ID=ubuntu
+ID_LIKE=debian
+`
+    expect(parseOsReleaseOrUname(sample)).toBe('ubuntu')
+  })
+
+  it('maps TencentOS to centos icon family', () => {
+    expect(normalizeDistroId('tencentos')).toBe('centos')
+    expect(
+      parseOsReleaseOrUname(`NAME="TencentOS Server"
+ID="tencentos"
+VERSION_ID="4"`)
+    ).toBe('centos')
+  })
+
+  it('parses PRETTY_NAME', () => {
+    expect(
+      parseOsPrettyName(`NAME="Ubuntu"
+PRETTY_NAME="Ubuntu 24.04.4 LTS"
+ID=ubuntu`)
+    ).toBe('Ubuntu 24.04.4 LTS')
+  })
+
+  it('resolves protocol defaults for desktop sessions', () => {
+    expect(resolveSessionDistro({ protocol: 'rdp' })).toBe('windows')
+    expect(resolveSessionDistro({ protocol: 'vnc' })).toBe('vnc')
+    expect(resolveSessionDistro({ protocol: 'ssh', distro: 'debian' })).toBe('debian')
+    expect(resolveSessionDistro({ protocol: 'ssh' })).toBe('linux')
+    expect(resolveSessionDistro({})).toBe('linux')
+  })
+})