chore: complete clean Agent Desk source snapshot

web/i18n/config.ts

@@ -0,0 +1,51 @@
+export const SUPPORTED_LOCALES = ["zh-CN", "en-US", "ru-RU"] as const
+export type AppLocale = (typeof SUPPORTED_LOCALES)[number]
+
+export const DEFAULT_LOCALE: AppLocale = "en-US"
+
+const LOCALE_ALIASES: Record<string, AppLocale> = {
+  zh: "zh-CN",
+  "zh-cn": "zh-CN",
+  zh_cn: "zh-CN",
+  "zh-hans": "zh-CN",
+  en: "en-US",
+  "en-us": "en-US",
+  en_us: "en-US",
+  ru: "ru-RU",
+  "ru-ru": "ru-RU",
+  ru_ru: "ru-RU",
+}
+
+export function normalizeLocale(value: string | null | undefined): AppLocale {
+  return normalizeSupportedLocale(value) ?? DEFAULT_LOCALE
+}
+
+function normalizeSupportedLocale(
+  value: string | null | undefined
+): AppLocale | null {
+  if (!value) {
+    return null
+  }
+  const key = value.trim().toLowerCase()
+  return LOCALE_ALIASES[key] ?? null
+}
+
+export function isSupportedLocale(
+  value: string | null | undefined
+): value is AppLocale {
+  if (!value) {
+    return false
+  }
+  return SUPPORTED_LOCALES.includes(value as AppLocale)
+}
+
+let configuredLocale: AppLocale = DEFAULT_LOCALE
+
+export function readStoredLocale(): AppLocale {
+  return configuredLocale
+}
+
+export function configureLocale(locale: string | null | undefined): AppLocale {
+  configuredLocale = normalizeLocale(locale)
+  return configuredLocale
+}