feat(WebMvcConfig): 优化时间格式处理

- 添加 LocalDateTime 序列化支持，使用 NORM_DATETIME_PATTERN 格式
- 设置 GMT+8 时区
- 使用 DatePattern.NORM_DATETIME_PATTERN 替代硬编码的日期格式

src/main/java/com/youlai/boot/config/WebMvcConfig.java

@@ -1,11 +1,14 @@
 package com.youlai.boot.config;
 
+import cn.hutool.core.date.DatePattern;
+import cn.hutool.core.date.DateTime;
 import com.fasterxml.jackson.core.JsonParser;
 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.ser.LocalDateTimeSerializer;
 import jakarta.validation.Validation;
 import jakarta.validation.Validator;
 import jakarta.validation.ValidatorFactory;
@@ -21,6 +24,9 @@ import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 import java.math.BigInteger;
 import java.text.SimpleDateFormat;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
 import java.util.List;
 
 /**
@@ -50,8 +56,12 @@ public class WebMvcConfig implements WebMvcConfigurer {
         SimpleModule simpleModule = new SimpleModule();
         simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
         simpleModule.addSerializer(BigInteger.class, ToStringSerializer.instance);
+        simpleModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(
+                DateTimeFormatter.ofPattern(DatePattern.NORM_DATETIME_PATTERN).withZone(ZoneId.of( "GMT+8"))
+        ));
         objectMapper.registerModule(simpleModule);
-        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
+        objectMapper.setDateFormat(new SimpleDateFormat(DatePattern.NORM_DATETIME_PATTERN));
+
 
         jackson2HttpMessageConverter.setObjectMapper(objectMapper);
         converters.add(1, jackson2HttpMessageConverter);