feat: add internationalization (i18n) to web dashboard — English + Chinese (#9453)

Add a lightweight i18n system to the web dashboard with English (default) and
Chinese language support. A language switcher with flag icons is placed in the
header bar, allowing users to toggle between languages. The choice persists
to localStorage.

Implementation:
- src/i18n/ — types, translation files (en.ts, zh.ts), React context + hook
- LanguageSwitcher component shows the *other* language's flag as the toggle
- I18nProvider wraps the app in main.tsx
- All 8 pages + OAuth components updated to use t() translation calls
- Zero new dependencies — pure React context + localStorage

web/src/i18n/zh.ts

@@ -0,0 +1,275 @@
+import type { Translations } from "./types";
+
+export const zh: Translations = {
+  common: {
+    save: "保存",
+    saving: "保存中...",
+    cancel: "取消",
+    close: "关闭",
+    delete: "删除",
+    refresh: "刷新",
+    retry: "重试",
+    search: "搜索...",
+    loading: "加载中...",
+    create: "创建",
+    creating: "创建中...",
+    set: "设置",
+    replace: "替换",
+    clear: "清除",
+    live: "在线",
+    off: "离线",
+    enabled: "已启用",
+    disabled: "已禁用",
+    active: "活跃",
+    inactive: "未激活",
+    unknown: "未知",
+    untitled: "无标题",
+    none: "无",
+    form: "表单",
+    noResults: "无结果",
+    of: "/",
+    page: "页",
+    msgs: "消息",
+    tools: "工具",
+    match: "匹配",
+    other: "其他",
+    configured: "已配置",
+    removed: "已移除",
+    failedToToggle: "切换失败",
+    failedToRemove: "移除失败",
+    failedToReveal: "显示失败",
+    collapse: "折叠",
+    expand: "展开",
+    general: "通用",
+    messaging: "消息平台",
+  },
+
+  app: {
+    brand: "Hermes Agent",
+    brandShort: "HA",
+    webUi: "管理面板",
+    footer: {
+      name: "Hermes Agent",
+      org: "Nous Research",
+    },
+    nav: {
+      status: "状态",
+      sessions: "会话",
+      analytics: "分析",
+      logs: "日志",
+      cron: "定时任务",
+      skills: "技能",
+      config: "配置",
+      keys: "密钥",
+    },
+  },
+
+  status: {
+    agent: "代理",
+    gateway: "网关",
+    activeSessions: "活跃会话",
+    recentSessions: "最近会话",
+    connectedPlatforms: "已连接平台",
+    running: "运行中",
+    starting: "启动中",
+    failed: "失败",
+    stopped: "已停止",
+    connected: "已连接",
+    disconnected: "已断开",
+    error: "错误",
+    notRunning: "未运行",
+    startFailed: "启动失败",
+    pid: "进程",
+    noneRunning: "无",
+    gatewayFailedToStart: "网关启动失败",
+    lastUpdate: "最后更新",
+    platformError: "错误",
+    platformDisconnected: "已断开",
+  },
+
+  sessions: {
+    title: "会话",
+    searchPlaceholder: "搜索消息内容...",
+    noSessions: "暂无会话",
+    noMatch: "没有匹配的会话",
+    startConversation: "开始对话后将显示在此处",
+    noMessages: "暂无消息",
+    untitledSession: "无标题会话",
+    deleteSession: "删除会话",
+    previousPage: "上一页",
+    nextPage: "下一页",
+    roles: {
+      user: "用户",
+      assistant: "助手",
+      system: "系统",
+      tool: "工具",
+    },
+  },
+
+  analytics: {
+    period: "时间范围：",
+    totalTokens: "总 Token 数",
+    totalSessions: "总会话数",
+    apiCalls: "API 调用",
+    dailyTokenUsage: "每日 Token 用量",
+    dailyBreakdown: "每日明细",
+    perModelBreakdown: "模型用量明细",
+    input: "输入",
+    output: "输出",
+    total: "总计",
+    noUsageData: "该时间段暂无使用数据",
+    startSession: "开始会话后将在此显示分析数据",
+    date: "日期",
+    model: "模型",
+    tokens: "Token",
+    perDayAvg: "/天 平均",
+    acrossModels: "共 {count} 个模型",
+    inOut: "输入 {input} / 输出 {output}",
+  },
+
+  logs: {
+    title: "日志",
+    autoRefresh: "自动刷新",
+    file: "文件",
+    level: "级别",
+    component: "组件",
+    lines: "行数",
+    noLogLines: "未找到日志记录",
+  },
+
+  cron: {
+    newJob: "新建定时任务",
+    nameOptional: "名称（可选）",
+    namePlaceholder: "例如：每日总结",
+    prompt: "提示词",
+    promptPlaceholder: "代理每次运行时应执行什么操作？",
+    schedule: "调度表达式（cron）",
+    schedulePlaceholder: "0 9 * * *",
+    deliverTo: "投递至",
+    scheduledJobs: "已调度任务",
+    noJobs: "暂无定时任务。在上方创建一个。",
+    last: "上次",
+    next: "下次",
+    pause: "暂停",
+    resume: "恢复",
+    triggerNow: "立即触发",
+    delivery: {
+      local: "本地",
+      telegram: "Telegram",
+      discord: "Discord",
+      slack: "Slack",
+      email: "邮件",
+    },
+  },
+
+  skills: {
+    title: "技能",
+    searchPlaceholder: "搜索技能和工具集...",
+    enabledOf: "已启用 {enabled}/{total}",
+    all: "全部",
+    noSkills: "未找到技能。技能从 ~/.hermes/skills/ 加载",
+    noSkillsMatch: "没有匹配的技能。",
+    skillCount: "{count} 个技能",
+    noDescription: "暂无描述。",
+    toolsets: "工具集",
+    noToolsetsMatch: "没有匹配的工具集。",
+    setupNeeded: "需要配置",
+    disabledForCli: "CLI 已禁用",
+    more: "还有 {count} 个",
+  },
+
+  config: {
+    configPath: "~/.hermes/config.yaml",
+    exportConfig: "导出配置为 JSON",
+    importConfig: "从 JSON 导入配置",
+    resetDefaults: "恢复默认值",
+    rawYaml: "原始 YAML 配置",
+    searchResults: "搜索结果",
+    fields: "个字段",
+    noFieldsMatch: '没有匹配"{query}"的字段',
+    configSaved: "配置已保存",
+    yamlConfigSaved: "YAML 配置已保存",
+    failedToSave: "保存失败",
+    failedToSaveYaml: "YAML 保存失败",
+    failedToLoadRaw: "加载原始配置失败",
+    configImported: "配置已导入 — 请检查后保存",
+    invalidJson: "无效的 JSON 文件",
+    categories: {
+      general: "通用",
+      agent: "代理",
+      terminal: "终端",
+      display: "显示",
+      delegation: "委托",
+      memory: "记忆",
+      compression: "压缩",
+      security: "安全",
+      browser: "浏览器",
+      voice: "语音",
+      tts: "文字转语音",
+      stt: "语音转文字",
+      logging: "日志",
+      discord: "Discord",
+      auxiliary: "辅助",
+    },
+  },
+
+  env: {
+    description: "管理存储在以下位置的 API 密钥和凭据",
+    changesNote: "更改会立即保存到磁盘。活跃会话将自动获取新密钥。",
+    hideAdvanced: "隐藏高级选项",
+    showAdvanced: "显示高级选项",
+    llmProviders: "LLM 提供商",
+    providersConfigured: "已配置 {configured}/{total} 个提供商",
+    getKey: "获取密钥",
+    notConfigured: "{count} 个未配置",
+    notSet: "未设置",
+    keysCount: "{count} 个密钥",
+    enterValue: "输入值...",
+    replaceCurrentValue: "替换当前值（{preview}）",
+    showValue: "显示实际值",
+    hideValue: "隐藏值",
+  },
+
+  oauth: {
+    title: "提供商登录（OAuth）",
+    providerLogins: "提供商登录（OAuth）",
+    description: "已连接 {connected}/{total} 个 OAuth 提供商。登录流程目前通过 CLI 运行；点击「复制命令」并粘贴到终端中进行设置。",
+    connected: "已连接",
+    expired: "已过期",
+    notConnected: "未连接。在终端中运行 {command}。",
+    runInTerminal: "在终端中。",
+    noProviders: "未检测到支持 OAuth 的提供商。",
+    login: "登录",
+    disconnect: "断开连接",
+    managedExternally: "外部管理",
+    copied: "已复制 ✓",
+    cli: "CLI",
+    copyCliCommand: "复制 CLI 命令（用于外部/备用方式）",
+    connect: "连接",
+    sessionExpires: "会话将在 {time} 后过期",
+    initiatingLogin: "正在启动登录流程…",
+    exchangingCode: "正在交换令牌…",
+    connectedClosing: "已连接！正在关闭…",
+    loginFailed: "登录失败。",
+    sessionExpired: "会话已过期。点击重试以开始新的登录。",
+    reOpenAuth: "重新打开授权页面",
+    reOpenVerification: "重新打开验证页面",
+    submitCode: "提交代码",
+    pasteCode: "粘贴授权代码（包含 #state 后缀也可以）",
+    waitingAuth: "等待您在浏览器中授权…",
+    enterCodePrompt: "已在新标签页中打开。如果需要，请输入以下代码：",
+    pkceStep1: "已在新标签页打开 claude.ai。请登录并点击「授权」。",
+    pkceStep2: "复制授权后显示的授权代码。",
+    pkceStep3: "将代码粘贴到下方并提交。",
+    flowLabels: {
+      pkce: "浏览器登录（PKCE）",
+      device_code: "设备代码",
+      external: "外部 CLI",
+    },
+    expiresIn: "{time}后过期",
+  },
+
+  language: {
+    switchTo: "切换到英文",
+  },
+};