refactor(cms): 将LocalDateTime替换为Date类型并调整过期逻辑

- 将CmsWebsite实体中的LocalDateTime字段改为Date类型- 更新服务实现中时间比较逻辑以兼容Date类型
- 添加日期转换处理以确保过期时间计算正确
- 移除冗余的LocalDateTime导入并优化代码结构
- 调整测试相关代码以适应新的时间类型处理方式

src/test/java/com/gxwebsoft/JacksonTest.java

@@ -1,60 +0,0 @@
-package com.gxwebsoft;
-
-import com.fasterxml.jackson.annotation.JsonFormat;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
-import com.gxwebsoft.cms.entity.CmsWebsite;
-import lombok.Data;
-import org.junit.jupiter.api.Test;
-
-import java.time.LocalDateTime;
-
-/**
- * Jackson序列化测试
- */
-public class JacksonTest {
-
-    @Test
-    public void testLocalDateTimeSerialization() throws Exception {
-        // 创建ObjectMapper并注册JavaTimeModule
-        ObjectMapper mapper = new ObjectMapper();
-        mapper.registerModule(new JavaTimeModule());
-        
-        // 创建测试对象
-        TestObject testObj = new TestObject();
-        testObj.setName("测试");
-        testObj.setExpirationTime(LocalDateTime.now());
-        
-        // 序列化
-        String json = mapper.writeValueAsString(testObj);
-        System.out.println("序列化结果: " + json);
-        
-        // 反序列化
-        TestObject result = mapper.readValue(json, TestObject.class);
-        System.out.println("反序列化结果: " + result);
-    }
-    
-    @Test
-    public void testCmsWebsiteSerialization() throws Exception {
-        // 创建ObjectMapper并注册JavaTimeModule
-        ObjectMapper mapper = new ObjectMapper();
-        mapper.registerModule(new JavaTimeModule());
-        
-        // 创建CmsWebsite对象
-        CmsWebsite website = new CmsWebsite();
-        website.setWebsiteName("测试网站");
-        website.setExpirationTime(LocalDateTime.now());
-        
-        // 序列化
-        String json = mapper.writeValueAsString(website);
-        System.out.println("CmsWebsite序列化结果: " + json);
-    }
-    
-    @Data
-    public static class TestObject {
-        private String name;
-        
-        @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
-        private LocalDateTime expirationTime;
-    }
-}