1.修改多线程配置，修复线程不复用的问题

src/main/java/com/yupi/springbootinit/config/AsyncConfig.java

@@ -0,0 +1,23 @@
+package com.yupi.springbootinit.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
+
+import java.util.concurrent.Executor;
+
+@Configuration
+@EnableAsync
+public class AsyncConfig {
+    @Bean
+    public Executor taskExecutor() {
+        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
+        executor.setCorePoolSize(10);  // 与 yaml 保持一致
+        executor.setMaxPoolSize(20);
+        executor.setQueueCapacity(200);
+        executor.setThreadNamePrefix("save-task-");
+        executor.initialize();
+        return executor;
+    }
+}