feat: add new interfaces, services, and utilities for API integration

refactor: reorganize type definitions and improve type safety

build: add lodash and @types/lodash as dependencies

chore: update tsconfig and vite config for path aliases

style: improve code organization and add documentation comments

fix: correct type usage in LanguageSwitcher component

perf: implement snackbar provider for global notifications

test: add new test interfaces and utility functions

ci: update pnpm-lock.yaml with new dependencies

src/locales/index.ts

@@ -11,7 +11,9 @@ import zh from './zh';
 export const LanguageAbbreviation = Object.freeze({
   En: 'en',
   Zh: 'zh',
-})
+} as const)
+
+export type LanguageAbbreviationType = (typeof LanguageAbbreviation)[keyof typeof LanguageAbbreviation]
 
 const resources = {
   [LanguageAbbreviation.En]: en,