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