feat(base): 为 BaseEntity 添加序列化接口并配置 Jackson 时间和 Long 类型处理

- 为 BaseEntity 类实现 Serializable 接口以支持序列化
- 新增 JacksonConfig 配置类处理时间格式和 Long 类型精度问题
- 配置时区为 Asia/Shanghai 和中国地区格式
- 添加 Long 类型的序列化和反序列化器避免前端精度丢失
- 将项目版本从 1.5.3 升级到 1.5.4

zkh-web/src/main/java/vip/jcfd/web/config/JacksonConfig.java

@@ -0,0 +1,56 @@
+package vip.jcfd.web.config;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.io.IOException;
+import java.time.ZoneId;
+import java.util.Locale;
+import java.util.TimeZone;
+
+
+@Configuration
+public class JacksonConfig {
+
+	/**
+	 * Configures Jackson mapper with locale, timezone, date format, serializer
+	 */
+	@Bean
+	public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
+		return jacksonObjectMapperBuilder -> {
+			jacksonObjectMapperBuilder.locale(Locale.CHINA);
+			jacksonObjectMapperBuilder.timeZone(TimeZone.getTimeZone(ZoneId.of("Asia/Shanghai")));
+			jacksonObjectMapperBuilder.simpleDateFormat("yyyy-MM-dd HH:mm:ss");
+			jacksonObjectMapperBuilder.serializers(new LongSerializer());
+			jacksonObjectMapperBuilder.deserializers(new LongDeserializer());
+		};
+	}
+
+	public static class LongSerializer extends JsonSerializer<Long> {
+		@Override
+		public void serialize(Long value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
+			if (value == null) {
+				gen.writeNull();
+				return;
+			}
+			gen.writeString(String.valueOf(value));
+		}
+	}
+
+	public static class LongDeserializer extends JsonDeserializer<Long> {
+		@Override
+		public Long deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
+			if (p.getText() == null) {
+				return null;
+			}
+			return Long.parseLong(p.getText());
+		}
+	}
+}