feat(iframe-bridge): implement iframe communication bridge and language sync

ragflow_web/src/app.tsx

@@ -24,6 +24,8 @@ import { SidebarProvider } from './components/ui/sidebar';
 import { TooltipProvider } from './components/ui/tooltip';
 import { ThemeEnum } from './constants/common';
 import storage from './utils/authorization-util';
+import Bridge from '@teres/iframe-bridge';
+import { LanguageAbbreviationMap, LanguageTranslationMap } from './constants/common';
 
 dayjs.extend(customParseFormat);
 dayjs.extend(advancedFormat);
@@ -99,6 +101,21 @@ const RootProvider = ({ children }: React.PropsWithChildren) => {
     if (lng) {
       i18n.changeLanguage(lng);
     }
+    // 在嵌入模式下，向父应用暴露 changeLanguage 方法以支持跨项目语言同步
+    if (Bridge.isEmbedded()) {
+      Bridge.initChildBridge({
+        methods: {
+          changeLanguage: (nextLng: string) => {
+            // 兼容传入缩写（en/zh/...）或显示名（English/Chinese/...）
+            const isAbbr = !!LanguageAbbreviationMap[nextLng as keyof typeof LanguageAbbreviationMap];
+            const resolved = isAbbr
+              ? nextLng
+              : LanguageTranslationMap[nextLng as keyof typeof LanguageTranslationMap] || nextLng;
+            i18n.changeLanguage(resolved);
+          },
+        },
+      });
+    }
   }, []);
 
   return (

ragflow_web/src/components/theme-provider.tsx

@@ -21,7 +21,7 @@ const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
 
 export function ThemeProvider({
   children,
-  defaultTheme = ThemeEnum.Dark,
+  defaultTheme = ThemeEnum.Light,
   storageKey = 'vite-ui-theme',
   ...props
 }: ThemeProviderProps) {