fix: use nacos-client 3.1.0-BETA.

Author: KomachiSion

auto-configurations/spring-ai-alibaba-autoconfigure-a2a-registry/src/main/java/com/alibaba/cloud/ai/autoconfigure/a2a/registry/nacos/NacosA2aDiscoveryAutoConfiguration.java

@@ -24,6 +24,7 @@
 import com.alibaba.nacos.api.exception.NacosException;
 
 import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -35,6 +36,7 @@
  * @author xiweng.yy
  */
 @AutoConfiguration(before = { A2aClientAgentCardProviderAutoConfiguration.class })
+@ConditionalOnClass({ A2aClientAgentCardProviderAutoConfiguration.class })
 @EnableConfigurationProperties({ NacosA2aProperties.class })
 @ConditionalOnProperty(prefix = NacosA2aProperties.PREFIX, value = "discovery.enabled", havingValue = "true",
 		matchIfMissing = true)

pom.xml

@@ -233,7 +233,7 @@
 
         <!-- Nacos -->
         <nacos2.version>2.5.1</nacos2.version>
-        <nacos3.version>3.1.0-SNAPSHOT</nacos3.version>
+        <nacos3.version>3.1.0-BETA</nacos3.version>
         <nacos-client-mse-extension.version>1.0.4</nacos-client-mse-extension.version>
         <spring-alibaba-nacos-config.version>2023.0.1.3</spring-alibaba-nacos-config.version>