是包名取错了，应该是zh而不是zh-cn.这样仍用原来的代码逻辑是对的。

web/i18n/languages.json

@@ -1,5 +1,5 @@
 {
     "en": "english",
     "ru": "русский",
-    "zh-CN": "中文"
+    "zh": "中文"
 }

web/src/lib/i18n/translations.ts

@@ -21,7 +21,7 @@ for (const [path, loader] of Object.entries(locFiles)) {
     };
 }
 
-const defaultLocale = 'zh-cn';
+const defaultLocale = 'en';
 const languages: Record<string, string> = _languages;
 
 const config: Config<{

web/src/routes/+layout.ts

@@ -12,9 +12,12 @@ export const load: Load = async ({ url }) => {
     const { pathname } = url;
 
     let preferredLocale = defaultLocale;
+    console.log("preferredLocale 1=========>", preferredLocale);
+
 
     if (browser) {
         preferredLocale = get((await import('$lib/i18n/locale')).default);
+        console.log("preferredLocale 2=========>", preferredLocale);
     }
 
     await loadTranslations(preferredLocale, pathname);