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

shared/types/ai.types.ts

@@ -2,8 +2,20 @@ export type AiProtocol = 'openai-chat' | 'openai-responses' | 'anthropic'
 
 export type AiAuthStyle = 'bearer' | 'x-api-key' | 'both' | 'none'
 
+/** 计费/部署形态：按量 · Plan/套餐 · 本地私有化 */
 export type AiBillingMode = 'payg' | 'plan' | 'local'
 
+/**
+ * Provider 产品分组（UI / 预设分类）：
+ * - openai_compatible：按量 OpenAI 兼容
+ * - standalone：Anthropic / Google Gemini
+ * - plan：套餐/Plan（GLM、MiniMax Token Plan、Kimi Code Plan）
+ * - local：Ollama / VLLM 私有化
+ * - custom：未收录供应商自填
+ */
+export type AiProviderFamily = 'openai_compatible' | 'standalone' | 'plan' | 'local' | 'custom'
+
+
 export type AiModelCapability = 'chat' | 'reasoning' | 'plan'
 
 export interface AiModelConfig {
@@ -23,6 +35,8 @@ export interface AiProviderConfig {
   id: string
   name: string
   presetId?: string
+  /** Product family for UI grouping; optional on legacy rows. */
+  family?: AiProviderFamily
   protocol: AiProtocol
   authStyle: AiAuthStyle
   baseUrl: string

shared/types/desktop.types.ts

@@ -0,0 +1,95 @@
+/** Shared remote-desktop (RDP / VNC) contracts for the renderer. */
+
+export type DesktopProtocol = 'rdp' | 'vnc'
+
+export type DesktopSecurity = 'nla' | 'tls' | 'rdp' | 'auto'
+
+export interface RdpConfig {
+  host: string
+  port?: number
+  username: string
+  password: string
+  domain?: string
+  /** Default NLA (CredSSP). */
+  security?: DesktopSecurity
+  width?: number
+  height?: number
+}
+
+export interface VncConfig {
+  host: string
+  port?: number
+  /** Optional VNC password (DES challenge). */
+  password?: string
+  width?: number
+  height?: number
+}
+
+export type DesktopSessionConfig =
+  | { protocol: 'rdp'; config: RdpConfig }
+  | { protocol: 'vnc'; config: VncConfig }
+
+export interface DesktopOpenResponse {
+  sessionId: string
+}
+
+export interface DesktopStatusEvent {
+  sessionId: string
+  status: 'connecting' | 'connected' | 'disconnected' | 'error'
+  message?: string
+  width?: number
+  height?: number
+}
+
+/** Dirty-rectangle frame. Prefer JPEG (`encoding: 'jpeg'`); `rgba` is raw w*h*4 fallback. */
+export interface DesktopFrameEvent {
+  sessionId: string
+  x: number
+  y: number
+  width: number
+  height: number
+  /** Full framebuffer width (for canvas sizing). */
+  fbWidth: number
+  /** Full framebuffer height. */
+  fbHeight: number
+  encoding: 'jpeg' | 'rgba'
+  dataBase64: string
+}
+
+export type DesktopPointerButton = 'left' | 'middle' | 'right' | 'wheel_up' | 'wheel_down'
+
+export interface DesktopPointerEvent {
+  x: number
+  y: number
+  button?: DesktopPointerButton
+  pressed?: boolean
+  /** true = pointer move (may include held button for drag). */
+  moving?: boolean
+}
+
+export interface DesktopKeyEvent {
+  key: string
+  code: string
+  pressed: boolean
+  altKey?: boolean
+  ctrlKey?: boolean
+  metaKey?: boolean
+  shiftKey?: boolean
+}
+
+export interface RdpClipboardEvent {
+  sessionId: string
+  text: string
+}
+
+export interface VncClipboardEvent {
+  sessionId: string
+  text: string
+}
+
+export interface RdpFileDownloadEvent {
+  sessionId: string
+  name: string
+  /** Absolute path in the host Downloads folder. */
+  path: string
+}

shared/types/host-metrics.types.ts

@@ -0,0 +1,26 @@
+export interface HostDiskMetric {
+  mount: string
+  percent: number
+  usedKb: number
+  totalKb: number
+}
+
+export interface HostMetrics {
+  /** /etc/os-release PRETTY_NAME, e.g. Ubuntu 24.04.4 LTS */
+  osPrettyName?: string
+  timezone?: string
+  timezoneOffset?: string
+  uptimeSec?: number
+  cpuPercent?: number
+  memUsedKb?: number
+  memTotalKb?: number
+  memPercent?: number
+  disks: HostDiskMetric[]
+}
+
+export interface HostMetricsResponse {
+  success: boolean
+  skipped?: boolean
+  metrics?: HostMetrics
+  error?: string
+}

shared/types/index.ts

@@ -11,3 +11,4 @@ export * from './ipc.types'
 export * from './known-hosts.types'
 export * from './serial.types'
 export * from './ai.types'
+export * from './host-metrics.types'

shared/types/serial.types.ts

@@ -1,5 +1,7 @@
 export type SerialParity = 'none' | 'odd' | 'even'
 export type SerialFlowControl = 'none' | 'software' | 'hardware'
+/** What to send when the user presses Enter (UART has no PTY line discipline). */
+export type SerialLineEnding = 'lf' | 'cr' | 'crlf'
 
 export interface SerialConfig {
   path: string
@@ -8,6 +10,9 @@ export interface SerialConfig {
   stopBits: 1 | 2
   parity: SerialParity
   flowControl: SerialFlowControl
+  /** Optional local echo — only for serial (PTY backends must stay echo-off). */
+  localEcho?: boolean
+  lineEnding?: SerialLineEnding
 }
 
 export interface SerialPortSummary {

shared/types/session.types.ts

@@ -6,6 +6,9 @@
 // 认证方式
 export type AuthType = 'password' | 'key' | 'agent'
 
+/** Persisted session protocol. Missing/undefined means SSH (legacy rows). */
+export type SessionProtocol = 'ssh' | 'rdp' | 'vnc'
+
 // 代理类型
 export type ProxyType = 'none' | 'http' | 'socks5'
 
@@ -65,9 +68,12 @@ export interface Session {
   port: number
   username: string
   authType: AuthType
+  /** Defaults to ssh when omitted (legacy sessions). */
+  protocol?: SessionProtocol
   password?: string        // 加密存储
-  privateKey?: string      // 私钥路径或内容
-  passphrase?: string      // 私钥密码
+  /** 私钥路径或 PEM 正文；落盘时由 Rust 加密 */
+  privateKey?: string
+  passphrase?: string      // 私钥密码（加密存储）
   proxy?: ProxyConfig      // 代理配置
   /** 连接成功后自动执行的启动命令 */
   startupCommand?: string
@@ -79,6 +85,20 @@ export interface Session {
   jumpHost?: JumpHostConfig
   /** 内联多跳板链 */
   jumpHosts?: JumpHostConfig[]
+  /** RDP domain (optional). */
+  domain?: string
+  /** RDP security mode. */
+  security?: 'nla' | 'tls' | 'rdp' | 'auto'
+  /** Desktop resolution hint (RDP/VNC). */
+  width?: number
+  height?: number
+  /**
+   * Detected or manual remote OS / distro icon id
+   * (ubuntu, debian, windows, vnc, linux, …).
+   */
+  distro?: string
+  /** Human-readable OS from PRETTY_NAME (e.g. Ubuntu 24.04.4 LTS). */
+  osPrettyName?: string
   group?: string
   tags?: string[]
   createdAt?: number
@@ -92,6 +112,7 @@ export interface SessionCreateRequest {
   port: number
   username: string
   authType: AuthType
+  protocol?: SessionProtocol
   password?: string
   privateKey?: string
   passphrase?: string
@@ -101,6 +122,11 @@ export interface SessionCreateRequest {
   jumpSessionIds?: string[]
   jumpHost?: JumpHostConfig
   jumpHosts?: JumpHostConfig[]
+  domain?: string
+  security?: 'nla' | 'tls' | 'rdp' | 'auto'
+  width?: number
+  height?: number
+  distro?: string
   group?: string
   tags?: string[]
 }

shared/types/sftp.types.ts

@@ -26,6 +26,8 @@ export interface TransferTask {
   transferred: number
   speed?: number  // bytes per second
   startTime?: number
+  /** Directory recursive transfer (upload_dir / download_dir). */
+  isDirectory?: boolean
 }
 
 // 传输进度