feat(web): 添加Jackson配置以序列化长整型和大整数为字符串

- 新增JacksonConfig配置类
- 配置Long和BigInteger类型序列化器
- 使用ToStringSerializer将数值转换为字符串
- 注册自定义序列化模块到Jackson ObjectMapper

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

@@ -0,0 +1,24 @@
+package vip.jcfd.web.config;
+
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+
+import java.math.BigInteger;
+
+@Configuration
+public class JacksonConfig {
+
+    @Bean
+    public Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder() {
+        ToStringSerializer toStringSerializer = ToStringSerializer.instance;
+        return new Jackson2ObjectMapperBuilder()
+                .modules(new SimpleModule()
+                        .addSerializer(Long.class, toStringSerializer)
+                        .addSerializer(Long.TYPE, toStringSerializer)
+                        .addSerializer(BigInteger.class, toStringSerializer)
+                );
+    }
+}