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/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);
+}