chore: restructure project and add i18n support

- Reorganize project structure with new electron and shared directories
- Add comprehensive i18n support with Chinese, English, and Japanese locales
- Update build configurations and TypeScript paths for new structure
- Add various UI components including chat interface and task management
- Include Windows release binaries and localization files
- Update dependencies and fix import paths throughout the codebase

src/i18n/constants.ts

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+export const SUPPORTED_LANGUAGE_CODES = ['en', 'zh', 'ja'] as const;
+export type LanguageCode = (typeof SUPPORTED_LANGUAGE_CODES)[number];
+
+export const SUPPORTED_LANGUAGES = [
+  { code: 'en', label: 'English' },
+  { code: 'zh', label: '中文' },
+  { code: 'ja', label: '日本語' },
+] as const;
+
+// 命名空间定义
+export const NAMESPACES = [
+  'common',
+  'conversation',
+  'setting',
+  'menu',
+  'login',
+  'dashboard',
+  'task',
+  'rate',
+  'knowledge',
+  'component',
+] as const;
+export type Namespace = (typeof NAMESPACES)[number];

src/i18n/index.ts

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+import { createI18n, type I18n, type I18nOptions } from 'vue-i18n';
+import { SUPPORTED_LANGUAGE_CODES, SUPPORTED_LANGUAGES, NAMESPACES, type LanguageCode } from './constants';
+import { resolveSupportedLanguage, detectSystemLanguage } from './resolver';
+
+// 使用 import.meta.glob 动态加载所有语言文件
+// 文件路径模式：./locales/{语言}/{命名空间}.json
+const modules = import.meta.glob('./locales/*/*.json', { eager: true });
+
+// 构建 vue-i18n 格式的资源对象：{ [locale]: { [namespace]: messages } }
+function buildResources() {
+  const resources: Record<string, Record<string, any>> = {};
+
+  // 初始化每种语言的空对象
+  SUPPORTED_LANGUAGE_CODES.forEach(lang => {
+    resources[lang] = {};
+  });
+
+  // 遍历所有模块，按语言和命名空间组织
+  for (const [path, module] of Object.entries(modules)) {
+    // 路径示例：'./locales/en/common.json'
+    const match = path.match(/\.\/locales\/([a-z]{2})\/([a-z]+)\.json$/);
+    if (!match) continue;
+
+    const [, lang, namespace] = match;
+    if (!SUPPORTED_LANGUAGE_CODES.includes(lang as LanguageCode) || !NAMESPACES.includes(namespace as any)) {
+      continue;
+    }
+
+    // @ts-expect-error: module 可能是 Module 类型
+    const messages = (module as any).default || module;
+    resources[lang][namespace] = messages;
+  }
+
+  return resources;
+}
+
+// 获取持久化的语言设置（稍后由 Pinia store 提供）
+function getPersistedLanguage(): LanguageCode | null {
+  try {
+    const saved = localStorage.getItem('diona-language');
+    return saved && SUPPORTED_LANGUAGE_CODES.includes(saved as LanguageCode) ? saved as LanguageCode : null;
+  } catch {
+    return null;
+  }
+}
+
+// 确定初始语言：持久化设置 > 系统语言 > 默认中文
+function determineInitialLocale(): LanguageCode {
+  const persisted = getPersistedLanguage();
+  if (persisted) return persisted;
+
+  const systemLang = detectSystemLanguage();
+  return systemLang;
+}
+
+async function createI18nInstance() {
+  const resources = buildResources();
+  const initialLocale = determineInitialLocale();
+
+  const options: I18nOptions = {
+    legacy: false,
+    locale: initialLocale,
+    fallbackLocale: 'zh',
+    messages: resources, // 使用构建的资源对象
+    availableLocales: SUPPORTED_LANGUAGE_CODES,
+    fallbackFormat: true,
+    datetimeFormats: {},
+    numberFormats: {},
+  };
+
+  const i18n = createI18n(options);
+  return i18n;
+}
+
+// 创建 i18n 实例
+export const i18n = await createI18nInstance();
+
+// 兼容性 API
+export async function setLanguage(lang: LanguageCode, _i18n?: I18n) {
+  const __i18n = _i18n ?? i18n;
+
+  if (__i18n.mode === 'legacy') {
+    __i18n.global.locale = lang;
+    return;
+  }
+
+  (__i18n.global.locale as unknown as { value: LanguageCode }).value = lang;
+  
+  // 持久化到 localStorage（稍后由 Pinia store 处理）
+  try {
+    localStorage.setItem('diona-language', lang);
+  } catch {}
+}
+
+export function getLanguage() {
+  if (i18n.mode === 'legacy') {
+    return i18n.global.locale;
+  }
+  
+  return (i18n.global.locale as unknown as { value: LanguageCode }).value;
+}
+
+// 导出类型和常量
+export type { LanguageCode };
+export { SUPPORTED_LANGUAGE_CODES, SUPPORTED_LANGUAGES, NAMESPACES };
+export default i18n;

src/i18n/locales/en.json

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+{
+  "window": {
+    "minimize": "Minimize",
+    "maximize": "Maximize",
+    "restore": "Restore",
+    "close": "Close"
+  },
+  "main": {
+    "welcome": {
+      "helloMessage": "Hello, I'm Diona"
+    },
+    "conversation": {
+      "placeholder": "Type a message...",
+      "newConversation": "New Conversation",
+      "selectModel": "Please select model",
+      "createConversation": "Create Conversation",
+      "searchPlaceholder": "Search conversations...",
+      "goSettings": "Go to",
+      "settings": "Settings Window",
+      "addModel": "to add a model",
+      "dialog": {
+        "title": "Confirm Deletion",
+        "content": "Are you sure you want to delete this conversation?",
+        "content_1": "Are you sure you want to delete the selected conversations? This action cannot be undone."
+      },
+      "operations": {
+        "pin": "Pin Selected",
+        "del": "Delete Selected",
+        "selectAll": "Select All",
+        "cancel": "Cancel"
+      }
+    },
+    "sidebar": {
+      "conversations": "Conversations",
+      "settings": "Settings",
+      "help": "Help"
+    },
+    "message": {
+      "dialog": {
+        "title": "Confirm Deletion",
+        "messageDelete": "Are you sure you want to delete this message?",
+        "batchDelete": "Are you sure you want to delete the selected messages?",
+        "copySuccess": "Copied successfully"
+      },
+      "batchActions": {
+        "deleteSelected": "Delete Selected"
+      },
+      "rendering": "Thinking...",
+      "stoppedGeneration": "(Stopped generating)",
+      "sending": "Sending",
+      "stopGeneration": "Stop generating",
+      "send": "Send"
+    }
+  },
+  "dialog": {
+    "cancel": "Cancel",
+    "confirm": "Confirm"
+  },
+  "settings": {
+    "title": "Settings",
+    "base": "Basic Settings",
+    "provider": {
+      "modelConfig": "Model Configuration"
+    },
+    "theme": {
+      "label": "Theme Settings",
+      "dark": "Dark Theme",
+      "light": "Light Theme",
+      "system": "System Theme",
+      "primaryColor": "Primary Color"
+    },
+    "appearance": {
+      "fontSize": "Font Size",
+      "fontSizeOptions": {
+        "10": "Tiny (10px)",
+        "12": "Small (12px)",
+        "14": "Normal (14px)",
+        "16": "Medium (16px)",
+        "18": "Large (18px)",
+        "20": "Larger (20px)",
+        "24": "Extra Large (24px)"
+      }
+    },
+    "behavior": {
+      "minimizeToTray": "Minimize to tray when closed"
+    },
+    "language": {
+      "label": "Language"
+    },
+    "providers": {
+      "defaultModel": "Default Model",
+      "apiKey": "API Key",
+      "apiUrl": "API URL"
+    }
+  },
+  "menu": {
+    "conversation": {
+      "newConversation": "New Conversation",
+      "sortBy": "Sort By",
+      "sortByCreateTime": "Sort by Creation Time",
+      "sortByUpdateTime": "Sort by Update Time",
+      "sortByName": "Sort by Name",
+      "sortByModel": "Sort by Model",
+      "sortAscending": "Ascending",
+      "sortDescending": "Descending",
+      "pinConversation": "Pin Conversation",
+      "unpinConversation": "Unpin Conversation",
+      "renameConversation": "Rename Conversation",
+      "delConversation": "Delete Conversation",
+      "batchOperations": "Batch Operations"
+    },
+    "message": {
+      "copyMessage": "Copy Message",
+      "deleteMessage": "Delete Message",
+      "selectMessage": "Select Message"
+    }
+  },
+  "tray": {
+    "tooltip": "Diona Application",
+    "showWindow": "Show Window",
+    "exit": "Exit"
+  },
+  "timeAgo": {
+    "justNow": "Just now",
+    "minutes": "{count} minutes ago",
+    "hours": "{count} hours ago",
+    "days": "{count} days ago",
+    "months": "{count} months ago",
+    "years": "{count} years ago",
+    "weekday": {
+      "sun": "Sunday",
+      "mon": "Monday",
+      "tue": "Tuesday",
+      "wed": "Wednesday",
+      "thu": "Thursday",
+      "fri": "Friday",
+      "sat": "Saturday"
+    }
+  },
+  "app": {
+    "title": "Diona Application"
+  }
+}

src/i18n/locales/en/common.json

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+{
+  "window": {
+    "minimize": "Minimize",
+    "maximize": "Maximize",
+    "restore": "Restore",
+    "close": "Close"
+  },
+  "dialog": {
+    "cancel": "Cancel",
+    "confirm": "Confirm"
+  },
+  "tray": {
+    "tooltip": "Diona Application",
+    "showWindow": "Show Window",
+    "exit": "Exit"
+  },
+  "timeAgo": {
+    "justNow": "Just now",
+    "minutes": "{count} minutes ago",
+    "hours": "{count} hours ago",
+    "days": "{count} days ago",
+    "months": "{count} months ago",
+    "years": "{count} years ago",
+    "weekday": {
+      "sun": "Sunday",
+      "mon": "Monday",
+      "tue": "Tuesday",
+      "wed": "Wednesday",
+      "thu": "Thursday",
+      "fri": "Friday",
+      "sat": "Saturday"
+    }
+  },
+  "app": {
+    "title": "Diona Application"
+  }
+}

src/i18n/locales/en/component.json

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+{}

src/i18n/locales/en/conversation.json

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+{
+  "welcome": {
+    "helloMessage": "Hello, I'm Diona"
+  },
+  "conversation": {
+    "placeholder": "Type a message...",
+    "newConversation": "New Conversation",
+    "selectModel": "Please select model",
+    "createConversation": "Create Conversation",
+    "searchPlaceholder": "Search conversations...",
+    "goSettings": "Go to",
+    "settings": "Settings Window",
+    "addModel": "to add a model",
+    "dialog": {
+      "title": "Confirm Deletion",
+      "content": "Are you sure you want to delete this conversation?",
+      "content_1": "Are you sure you want to delete the selected conversations? This action cannot be undone."
+    },
+    "operations": {
+      "pin": "Pin Selected",
+      "del": "Delete Selected",
+      "selectAll": "Select All",
+      "cancel": "Cancel"
+    }
+  },
+  "sidebar": {
+    "conversations": "Conversations",
+    "settings": "Settings",
+    "help": "Help"
+  },
+  "message": {
+    "dialog": {
+      "title": "Confirm Deletion",
+      "messageDelete": "Are you sure you want to delete this message?",
+      "batchDelete": "Are you sure you want to delete the selected messages?",
+      "copySuccess": "Copied successfully"
+    },
+    "batchActions": {
+      "deleteSelected": "Delete Selected"
+    },
+    "rendering": "Thinking...",
+    "stoppedGeneration": "(Stopped generating)",
+    "sending": "Sending",
+    "stopGeneration": "Stop generating",
+    "send": "Send"
+  }
+}

src/i18n/locales/en/dashboard.json

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+{}

src/i18n/locales/en/knowledge.json

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+{}

src/i18n/locales/en/login.json

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+{
+  "title": "Login",
+  "subtitle": "24/7 digital employee, never closed",
+  "username": "Username",
+  "usernamePlaceholder": "Please enter username",
+  "password": "Password",
+  "passwordPlaceholder": "Please enter password",
+  "code": "Verification Code",
+  "codePlaceholder": "Please enter verification code",
+  "loginButton": "Login",
+  "rememberPassword": "Remember password",
+  "forgotPassword": "Forgot password?",
+  "agreeTerms": "I agree to the",
+  "termsOfUse": "Terms of Use",
+  "privacyPolicy": "Privacy Policy",
+  "and": "and",
+  "usernameRequired": "Please enter username",
+  "passwordRequired": "Please enter password",
+  "codeRequired": "Please enter verification code"
+}

src/i18n/locales/en/menu.json

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+{
+  "conversation": {
+    "newConversation": "New Conversation",
+    "sortBy": "Sort By",
+    "sortByCreateTime": "Sort by Creation Time",
+    "sortByUpdateTime": "Sort by Update Time",
+    "sortByName": "Sort by Name",
+    "sortByModel": "Sort by Model",
+    "sortAscending": "Ascending",
+    "sortDescending": "Descending",
+    "pinConversation": "Pin Conversation",
+    "unpinConversation": "Unpin Conversation",
+    "renameConversation": "Rename Conversation",
+    "delConversation": "Delete Conversation",
+    "batchOperations": "Batch Operations"
+  },
+  "message": {
+    "copyMessage": "Copy Message",
+    "deleteMessage": "Delete Message",
+    "selectMessage": "Select Message"
+  }
+}

src/i18n/locales/en/rate.json

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+{}

src/i18n/locales/en/setting.json

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+{
+  "title": "Settings",
+  "base": "Basic Settings",
+  "provider": {
+    "modelConfig": "Model Configuration"
+  },
+  "theme": {
+    "label": "Theme Settings",
+    "dark": "Dark Theme",
+    "light": "Light Theme",
+    "system": "System Theme",
+    "primaryColor": "Primary Color"
+  },
+  "appearance": {
+    "fontSize": "Font Size",
+    "fontSizeOptions": {
+      "10": "Tiny (10px)",
+      "12": "Small (12px)",
+      "14": "Normal (14px)",
+      "16": "Medium (16px)",
+      "18": "Large (18px)",
+      "20": "Larger (20px)",
+      "24": "Extra Large (24px)"
+    }
+  },
+  "behavior": {
+    "minimizeToTray": "Minimize to tray when closed"
+  },
+  "language": {
+    "label": "Language"
+  },
+  "providers": {
+    "defaultModel": "Default Model",
+    "apiKey": "API Key",
+    "apiUrl": "API URL"
+  }
+}

src/i18n/locales/en/task.json

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+{}

src/i18n/locales/ja.json

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+{}

src/i18n/locales/ja/common.json

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+{}

src/i18n/locales/ja/component.json

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+{}

src/i18n/locales/ja/conversation.json

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+{}

src/i18n/locales/ja/dashboard.json

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+{}

src/i18n/locales/ja/knowledge.json

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+{}

src/i18n/locales/ja/login.json

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+{}

src/i18n/locales/ja/menu.json

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+{}

src/i18n/locales/ja/rate.json

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+{}

src/i18n/locales/ja/setting.json

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+{}

src/i18n/locales/ja/task.json

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+{}

src/i18n/locales/zh.json

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+{
+  "window": {
+    "minimize": "最小化",
+    "maximize": "最大化",
+    "restore": "还原",
+    "close": "关闭"
+  },
+  "main": {
+    "welcome": {
+      "helloMessage": "你好，我是迪奥娜"
+    },
+    "conversation": {
+      "placeholder": "输入消息...",
+      "newConversation": "新对话",
+      "selectModel": "请选择模型",
+      "createConversation": "创建对话",
+      "searchPlaceholder": "搜索对话...",
+      "goSettings": "快去",
+      "settings": "设置窗口",
+      "addModel": "添加模型",
+      "dialog": {
+        "title": "确认删除",
+        "content": "确定要删除这个对话吗？",
+        "content_1": "确定要删除选中的对话吗？此操作不可撤销。"
+      },
+      "operations": {
+        "pin": "置顶所选",
+        "del": "删除所选",
+        "selectAll": "全选",
+        "cancel": "取消"
+      }
+    },
+    "sidebar": {
+      "conversations": "对话",
+      "settings": "设置",
+      "help": "帮助"
+    },
+    "message": {
+      "dialog": {
+        "title": "确认删除",
+        "messageDelete": "确认删除该条消息？",
+        "batchDelete": "确认删除选中的消息？",
+        "copySuccess": "复制成功"
+      },
+      "batchActions": {
+        "deleteSelected": "删除选中项"
+      },
+      "rendering": "思考中...",
+      "stoppedGeneration": "(已停止生成)",
+      "sending": "发送中",
+      "stopGeneration": "停止生成",
+      "send": "发送"
+    }
+  },
+  "dialog": {
+    "cancel": "取消",
+    "confirm": "确认"
+  },
+  "settings": {
+    "title": "设置",
+    "base": "基础设置",
+    "provider": {
+      "modelConfig": "模型配置"
+    },
+    "providers": {
+      "defaultModel": "默认模型",
+      "apiKey": "API密钥",
+      "apiUrl": "API地址"
+    },
+    "theme": {
+      "label": "主题设置",
+      "dark": "深色主题",
+      "light": "浅色主题",
+      "system": "跟随系统",
+      "primaryColor": "主题颜色"
+    },
+    "appearance": {
+      "fontSize": "字体大小",
+      "fontSizeOptions": {
+        "10": "极小 (10px)",
+        "12": "小 (12px)",
+        "14": "正常 (14px)",
+        "16": "中 (16px)",
+        "18": "大 (18px)",
+        "20": "较大 (20px)",
+        "24": "超大 (24px)"
+      }
+    },
+    "behavior": {
+      "minimizeToTray": "关闭时最小化到托盘"
+    },
+    "language": {
+      "label": "语言设置"
+    }
+  },
+  "menu": {
+    "conversation": {
+      "newConversation": "新建对话",
+      "sortBy": "排序方式",
+      "sortByCreateTime": "按创建时间排序",
+      "sortByUpdateTime": "按更新时间排序",
+      "sortByName": "按名称排序",
+      "sortByModel": "按模型排序",
+      "sortAscending": "递增",
+      "sortDescending": "递减",
+      "pinConversation": "置顶对话",
+      "unpinConversation": "取消置顶",
+      "renameConversation": "重命名对话",
+      "delConversation": "删除对话",
+      "batchOperations": "批量操作"
+    },
+    "message": {
+      "copyMessage": "复制消息",
+      "deleteMessage": "删除消息",
+      "selectMessage": "选择消息"
+    }
+  },
+  "tray": {
+    "tooltip": "迪奥娜",
+    "showWindow": "显示窗口",
+    "exit": "退出"
+  },
+  "timeAgo": {
+    "justNow": "刚刚",
+    "minutes": "{count}分钟前",
+    "hours": "{count}小时前",
+    "days": "{count}天前",
+    "months": "{count}个月前",
+    "years": "{count}年前",
+    "weekday": {
+      "sun": "星期日",
+      "mon": "星期一",
+      "tue": "星期二",
+      "wed": "星期三",
+      "thu": "星期四",
+      "fri": "星期五",
+      "sat": "星期六"
+    }
+  },
+  "app": {
+    "title": "迪奥娜"
+  }
+}

src/i18n/locales/zh/common.json

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+{
+  "window": {
+    "minimize": "最小化",
+    "maximize": "最大化",
+    "restore": "还原",
+    "close": "关闭"
+  },
+  "dialog": {
+    "cancel": "取消",
+    "confirm": "确认"
+  },
+  "tray": {
+    "tooltip": "迪奥娜",
+    "showWindow": "显示窗口",
+    "exit": "退出"
+  },
+  "timeAgo": {
+    "justNow": "刚刚",
+    "minutes": "{count}分钟前",
+    "hours": "{count}小时前",
+    "days": "{count}天前",
+    "months": "{count}个月前",
+    "years": "{count}年前",
+    "weekday": {
+      "sun": "星期日",
+      "mon": "星期一",
+      "tue": "星期二",
+      "wed": "星期三",
+      "thu": "星期四",
+      "fri": "星期五",
+      "sat": "星期六"
+    }
+  },
+  "app": {
+    "title": "迪奥娜"
+  }
+}

src/i18n/locales/zh/component.json

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+{}

src/i18n/locales/zh/conversation.json

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+{
+  "welcome": {
+    "helloMessage": "你好，我是迪奥娜"
+  },
+  "conversation": {
+    "placeholder": "输入消息...",
+    "newConversation": "新对话",
+    "selectModel": "请选择模型",
+    "createConversation": "创建对话",
+    "searchPlaceholder": "搜索对话...",
+    "goSettings": "快去",
+    "settings": "设置窗口",
+    "addModel": "添加模型",
+    "dialog": {
+      "title": "确认删除",
+      "content": "确定要删除这个对话吗？",
+      "content_1": "确定要删除选中的对话吗？此操作不可撤销。"
+    },
+    "operations": {
+      "pin": "置顶所选",
+      "del": "删除所选",
+      "selectAll": "全选",
+      "cancel": "取消"
+    }
+  },
+  "sidebar": {
+    "conversations": "对话",
+    "settings": "设置",
+    "help": "帮助"
+  },
+  "message": {
+    "dialog": {
+      "title": "确认删除",
+      "messageDelete": "确认删除该条消息？",
+      "batchDelete": "确认删除选中的消息？",
+      "copySuccess": "复制成功"
+    },
+    "batchActions": {
+      "deleteSelected": "删除选中项"
+    },
+    "rendering": "思考中...",
+    "stoppedGeneration": "(已停止生成)",
+    "sending": "发送中",
+    "stopGeneration": "停止生成",
+    "send": "发送"
+  }
+}

src/i18n/locales/zh/dashboard.json

@@ -0,0 +1 @@
+{}

src/i18n/locales/zh/knowledge.json

@@ -0,0 +1 @@
+{}

src/i18n/locales/zh/login.json

@@ -0,0 +1,20 @@
+{
+  "title": "登录",
+  "subtitle": "24小时在岗，从不打烊的数字员工",
+  "username": "账号",
+  "usernamePlaceholder": "请输入账号",
+  "password": "密码",
+  "passwordPlaceholder": "请输入密码",
+  "code": "验证码",
+  "codePlaceholder": "请输入验证码",
+  "loginButton": "登 录",
+  "rememberPassword": "记住密码",
+  "forgotPassword": "忘记密码？",
+  "agreeTerms": "我已同意",
+  "termsOfUse": "《使用协议》",
+  "privacyPolicy": "《隐私协议》",
+  "and": "和",
+  "usernameRequired": "请输入账号",
+  "passwordRequired": "请输入密码",
+  "codeRequired": "请输入验证码"
+}

src/i18n/locales/zh/menu.json

@@ -0,0 +1,22 @@
+{
+  "conversation": {
+    "newConversation": "新建对话",
+    "sortBy": "排序方式",
+    "sortByCreateTime": "按创建时间排序",
+    "sortByUpdateTime": "按更新时间排序",
+    "sortByName": "按名称排序",
+    "sortByModel": "按模型排序",
+    "sortAscending": "递增",
+    "sortDescending": "递减",
+    "pinConversation": "置顶对话",
+    "unpinConversation": "取消置顶",
+    "renameConversation": "重命名对话",
+    "delConversation": "删除对话",
+    "batchOperations": "批量操作"
+  },
+  "message": {
+    "copyMessage": "复制消息",
+    "deleteMessage": "删除消息",
+    "selectMessage": "选择消息"
+  }
+}

src/i18n/locales/zh/rate.json

@@ -0,0 +1 @@
+{}

src/i18n/locales/zh/setting.json

@@ -0,0 +1,37 @@
+{
+  "title": "设置",
+  "base": "基础设置",
+  "provider": {
+    "modelConfig": "模型配置"
+  },
+  "theme": {
+    "label": "主题设置",
+    "dark": "深色主题",
+    "light": "浅色主题",
+    "system": "跟随系统",
+    "primaryColor": "主题颜色"
+  },
+  "appearance": {
+    "fontSize": "字体大小",
+    "fontSizeOptions": {
+      "10": "极小 (10px)",
+      "12": "小 (12px)",
+      "14": "正常 (14px)",
+      "16": "中 (16px)",
+      "18": "大 (18px)",
+      "20": "较大 (20px)",
+      "24": "超大 (24px)"
+    }
+  },
+  "behavior": {
+    "minimizeToTray": "关闭时最小化到托盘"
+  },
+  "language": {
+    "label": "语言设置"
+  },
+  "providers": {
+    "defaultModel": "默认模型",
+    "apiKey": "API密钥",
+    "apiUrl": "API地址"
+  }
+}

src/i18n/locales/zh/task.json

@@ -0,0 +1 @@
+{}

src/i18n/resolver.ts

@@ -0,0 +1,38 @@
+import { SUPPORTED_LANGUAGE_CODES, type LanguageCode } from './constants';
+
+// 创建语言代码集合用于快速查找
+const SUPPORTED_LANGUAGE_CODE_SET = new Set<string>(SUPPORTED_LANGUAGE_CODES);
+
+/**
+ * 标准化语言代码（处理 zh-CN、zh_TW 等变体）
+ */
+export function normalizeLocale(locale: string | null | undefined): string {
+  return locale?.trim().toLowerCase().replaceAll('_', '-') ?? '';
+}
+
+/**
+ * 解析支持的语言代码
+ * @param locale 原始语言代码（如 'zh-CN', 'en-US'）
+ * @param fallback 回退语言代码，默认为 'zh'
+ * @returns 支持的语言代码
+ */
+export function resolveSupportedLanguage(
+  locale: string | null | undefined,
+  fallback: LanguageCode = 'zh',
+): LanguageCode {
+  const normalizedLocale = normalizeLocale(locale);
+  if (!normalizedLocale) return fallback;
+
+  const [baseLanguage] = normalizedLocale.split('-');
+  return SUPPORTED_LANGUAGE_CODE_SET.has(baseLanguage)
+    ? (baseLanguage as LanguageCode)
+    : fallback;
+}
+
+/**
+ * 检测系统语言
+ */
+export function detectSystemLanguage(): LanguageCode {
+  if (typeof navigator === 'undefined') return 'zh';
+  return resolveSupportedLanguage(navigator.language);
+}