feat(i18n): add zh/en locale switching

i18n/config.ts

@@ -0,0 +1,3 @@
+export const locales = ["zh-CN", "en"] as const
+export type Locale = (typeof locales)[number]
+export const defaultLocale: Locale = "zh-CN"

i18n/request.ts

@@ -0,0 +1,13 @@
+import { getRequestConfig } from "next-intl/server"
+
+import { defaultLocale, locales } from "./config"
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  const requested = await requestLocale
+  const locale = requested && locales.includes(requested as (typeof locales)[number]) ? requested : defaultLocale
+
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  }
+})

i18n/routing.ts

@@ -0,0 +1,8 @@
+import { defineRouting } from "next-intl/routing"
+import { locales, defaultLocale } from "./config"
+
+export const routing = defineRouting({
+  locales,
+  defaultLocale,
+  localePrefix: "never",
+})