增加LLM 后端服务API配置信息

yudao-module-llm/yudao-module-llm-biz/src/main/java/cn/iocoder/yudao/module/llm/framework/backend/config/LLMBackendProperties.java

@@ -5,7 +5,6 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.validation.annotation.Validated;
 
 import javax.validation.constraints.NotNull;
-import java.time.Duration;
 
 @ConfigurationProperties(prefix = "llm.backend")
 @Validated
@@ -16,5 +15,5 @@ public class LLMBackendProperties {
      * 过期时间
      */
     @NotNull(message = "RAG健康检查API")
-    private Duration ragHealth;
+    private String ragHealth;
 }