feat(audit): 增强审计日志功能

- 添加数据库迁移脚本，为 audit_log 表补充缺失字段（create_by, update_by, updated_at, deleted_at）
- 改进审计日志切面，排除对审计日志实体本身的审计，避免循环依赖
- 优化 ObjectMapper 配置，禁用时间戳序列化和自引用失败

gym-manage-api/manage-app/src/main/java/cn/novalon/gym/manage/app/config/JacksonConfig.java

@@ -3,6 +3,8 @@ package cn.novalon.gym.manage.app.config;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
 import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
@@ -39,6 +41,12 @@ public class JacksonConfig {
         javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(formatter));
 
         objectMapper.registerModule(javaTimeModule);
+        
+        SimpleModule longModule = new SimpleModule();
+        longModule.addSerializer(Long.class, ToStringSerializer.instance);
+        longModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
+        objectMapper.registerModule(longModule);
+        
         objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
         objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);