feat(product): 新增商品及SKU实体和相关配置

- 添加商品实体类MtProduct及其Mapper接口
- 添加商品SKU实体类MtProductSku及其Mapper接口
- 配置MyBatis-Plus分页插件和自动填充处理器
- 完善实体字段注释和数据类型定义
- 集成SLF4J日志功能并添加详细使用指南文档

mt-pay/src/main/java/com/mtkj/mtpay/config/MyBatisPlusConfig.java

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+package com.mtkj.mtpay.config;
+
+import com.baomidou.mybatisplus.annotation.DbType;
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import lombok.extern.slf4j.Slf4j;
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * MyBatis-Plus配置类
+ */
+@Slf4j
+@Configuration
+@MapperScan("com.mtkj.mtpay.mapper")
+public class MyBatisPlusConfig {
+    
+    /**
+     * 分页插件配置
+     */
+    @Bean
+    public MybatisPlusInterceptor mybatisPlusInterceptor() {
+        log.info("初始化MyBatis-Plus分页插件，数据库类型: {}", DbType.MYSQL);
+        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
+        // 添加分页插件
+        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
+        log.info("MyBatis-Plus分页插件配置完成");
+        return interceptor;
+    }
+}
+

mt-pay/src/main/java/com/mtkj/mtpay/config/MyMetaObjectHandler.java

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+package com.mtkj.mtpay.config;
+
+import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.ibatis.reflection.MetaObject;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+
+/**
+ * MyBatis-Plus自动填充处理器
+ * 用于自动填充创建时间和更新时间
+ */
+@Slf4j
+@Component
+public class MyMetaObjectHandler implements MetaObjectHandler {
+    
+    @Override
+    public void insertFill(MetaObject metaObject) {
+        log.debug("开始插入填充...");
+        this.strictInsertFill(metaObject, "createTime", LocalDateTime.class, LocalDateTime.now());
+        this.strictInsertFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
+    }
+    
+    @Override
+    public void updateFill(MetaObject metaObject) {
+        log.debug("开始更新填充...");
+        this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
+    }
+}
+

mt-pay/src/main/java/com/mtkj/mtpay/entity/MtProduct.java

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+package com.mtkj.mtpay.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 商品实体类
+ */
+@TableName(value = "mt_product")
+@Data
+public class MtProduct {
+    
+    /**
+     * 商品ID
+     */
+    @TableId(value = "id", type = IdType.AUTO)
+    private Long id;
+    
+    /**
+     * 商品名称
+     */
+    @TableField(value = "name", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String name;
+    
+    /**
+     * 商品价格（基础价格，SKU可能有不同价格）
+     */
+    @TableField(value = "price", jdbcType = org.apache.ibatis.type.JdbcType.DECIMAL)
+    private BigDecimal price;
+    
+    /**
+     * 主图URL（最大4000字符）
+     */
+    @TableField(value = "main_image", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String mainImage;
+    
+    /**
+     * 商品状态：ACTIVE-上架，INACTIVE-下架，DELETED-已删除
+     */
+    @TableField(value = "status", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String status;
+    
+    /**
+     * 店铺ID
+     */
+    @TableField(value = "shop_id", jdbcType = org.apache.ibatis.type.JdbcType.BIGINT)
+    private Long shopId;
+    
+    /**
+     * 创建时间
+     */
+    @TableField(value = "create_time", fill = FieldFill.INSERT)
+    private LocalDateTime createTime;
+    
+    /**
+     * 更新时间
+     */
+    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updateTime;
+}
+

mt-pay/src/main/java/com/mtkj/mtpay/entity/MtProductSku.java

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+package com.mtkj.mtpay.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 商品SKU实体类
+ */
+@TableName(value = "mt_product_sku")
+@Data
+public class MtProductSku {
+    
+    /**
+     * SKU ID
+     */
+    @TableId(value = "id", type = IdType.AUTO)
+    private Long id;
+    
+    /**
+     * 商品ID
+     */
+    @TableField(value = "product_id", jdbcType = org.apache.ibatis.type.JdbcType.BIGINT)
+    private Long productId;
+    
+    /**
+     * SKU编码（最大2000字符）
+     */
+    @TableField(value = "sku", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String sku;
+    
+    /**
+     * 价格
+     */
+    @TableField(value = "price", jdbcType = org.apache.ibatis.type.JdbcType.DECIMAL)
+    private BigDecimal price;
+    
+    /**
+     * 货币（ISO 4217三位币种代码，如USD、CNY）
+     */
+    @TableField(value = "currency", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String currency;
+    
+    /**
+     * 库存数量
+     */
+    @TableField(value = "stock", jdbcType = org.apache.ibatis.type.JdbcType.INTEGER)
+    private Integer stock;
+    
+    /**
+     * 销售属性名称（LONGTEXT，JSON格式，如：[{"name":"颜色","value":"红色"},{"name":"尺寸","value":"大号"}]）
+     */
+    @TableField(value = "sales_attrs", jdbcType = org.apache.ibatis.type.JdbcType.LONGVARCHAR)
+    private String salesAttrs;
+    
+    /**
+     * SKU图片URL（最大4000字符）
+     */
+    @TableField(value = "sku_image", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String skuImage;
+    
+    /**
+     * 重量（单位：克）
+     */
+    @TableField(value = "weight", jdbcType = org.apache.ibatis.type.JdbcType.DECIMAL)
+    private BigDecimal weight;
+    
+    /**
+     * 大小/尺寸（JSON格式，如：{"length":10,"width":5,"height":3}，单位：厘米）
+     */
+    @TableField(value = "size", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String size;
+    
+    /**
+     * 规格（文本描述，最大2000字符）
+     */
+    @TableField(value = "specification", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String specification;
+    
+    /**
+     * SKU状态：ACTIVE-启用，INACTIVE-禁用
+     */
+    @TableField(value = "status", jdbcType = org.apache.ibatis.type.JdbcType.VARCHAR)
+    private String status;
+    
+    /**
+     * 创建时间
+     */
+    @TableField(value = "create_time", fill = FieldFill.INSERT)
+    private LocalDateTime createTime;
+    
+    /**
+     * 更新时间
+     */
+    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updateTime;
+}
+

mt-pay/src/main/java/com/mtkj/mtpay/mapper/MtProductMapper.java

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+package com.mtkj.mtpay.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.mtkj.mtpay.entity.MtProduct;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 商品Mapper接口
+ */
+@Mapper
+public interface MtProductMapper extends BaseMapper<MtProduct> {
+}
+

mt-pay/src/main/java/com/mtkj/mtpay/mapper/MtProductSkuMapper.java

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+package com.mtkj.mtpay.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.mtkj.mtpay.entity.MtProductSku;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 商品SKU Mapper接口
+ */
+@Mapper
+public interface MtProductSkuMapper extends BaseMapper<MtProductSku> {
+}
+