修复讲解业务 API 数据源配置

src/usecases/explainUseCase.ts

@@ -394,7 +394,7 @@ export class ExplainUseCase {
     const entryTarget = await this.resolveDetailEntryTarget(request)
     const fallbackExhibit = await this.resolveStaticDetailFallback(request, entryTarget)
 
-    if (fallbackExhibit) {
+    if (fallbackExhibit && dataSourceConfig.explainContentMode !== 'remote') {
       return this.applyLanguageVariant(fallbackExhibit, entryTarget.lang)
     }
 
@@ -403,7 +403,7 @@ export class ExplainUseCase {
       .catch((error) => ({ stopInfo: null, error }))
 
     if (stopInfoResult.stopInfo) {
-      return this.toExhibitFromStopInfo(stopInfoResult.stopInfo, null)
+      return this.toExhibitFromStopInfo(stopInfoResult.stopInfo, fallbackExhibit)
     }
 
     throw stopInfoResult.error || new Error('讲解详情加载失败')