feat: 初始化后端项目基础架构

添加项目基础配置文件和目录结构
实现用户、角色、权限等核心模块的实体类、Mapper接口和服务层
配置数据库连接和MyBatis-Plus支持
添加统一响应格式和异常处理机制

src/main/java/com/qf/backend/mapper/OrderItemsMapper.java

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+package com.qf.backend.mapper;
+
+import java.util.List;
+
+import org.apache.ibatis.annotations.Select;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.OrderItems;
+
+/**
+ * 订单商品项表 Mapper 接口
+ */
+public interface OrderItemsMapper extends BaseMapper<OrderItems> {
+    QueryWrapper<OrderItems> qw = new QueryWrapper<>();
+    /**
+     * 根据订单ID查询订单项
+     * @param orderId 订单ID
+     * @return 订单项列表
+     */
+    @Select("select * from order_items where order_id = #{orderId}")
+    List<OrderItems> selectByOrderId(Long orderId);
+    /**
+     * 根据商品ID查询订单项
+     * @param productId 商品ID
+     * @return 订单项列表
+     */
+    @Select("select * from order_items where product_id = #{productId}")
+    List<OrderItems> selectByProductId(Long productId);
+}

src/main/java/com/qf/backend/mapper/OrderStatusHistoryMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.OrderStatusHistory;
+
+/**
+ * 订单状态历史表 Mapper 接口
+ */
+public interface OrderStatusHistoryMapper extends BaseMapper<OrderStatusHistory> {
+}

src/main/java/com/qf/backend/mapper/OrdersMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Orders;
+
+/**
+ * 订单主表 Mapper 接口
+ */
+public interface OrdersMapper extends BaseMapper<Orders> {
+    /**
+     * 根据订单号查询订单
+     * @param orderNumber 订单号
+     * @return 订单信息
+     */
+    Orders selectByOrderNumber(String orderNumber);
+}

src/main/java/com/qf/backend/mapper/PaymentsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Payments;
+
+/**
+ * 支付信息表 Mapper 接口
+ */
+public interface PaymentsMapper extends BaseMapper<Payments> {
+}

src/main/java/com/qf/backend/mapper/PermissionsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Permissions;
+
+/**
+ * 权限信息表 Mapper 接口
+ */
+public interface PermissionsMapper extends BaseMapper<Permissions> {
+}

src/main/java/com/qf/backend/mapper/ProductAttributeValuesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductAttributeValues;
+
+/**
+ * 商品属性值表 Mapper 接口
+ */
+public interface ProductAttributeValuesMapper extends BaseMapper<ProductAttributeValues> {
+}

src/main/java/com/qf/backend/mapper/ProductAttributesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductAttributes;
+
+/**
+ * 商品属性表 Mapper 接口
+ */
+public interface ProductAttributesMapper extends BaseMapper<ProductAttributes> {
+}

src/main/java/com/qf/backend/mapper/ProductCategoriesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductCategories;
+
+/**
+ * 商品分类表 Mapper 接口
+ */
+public interface ProductCategoriesMapper extends BaseMapper<ProductCategories> {
+}

src/main/java/com/qf/backend/mapper/ProductImagesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductImages;
+
+/**
+ * 商品图片表 Mapper 接口
+ */
+public interface ProductImagesMapper extends BaseMapper<ProductImages> {
+}

src/main/java/com/qf/backend/mapper/ProductInventoriesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductInventories;
+
+/**
+ * 库存信息表 Mapper 接口
+ */
+public interface ProductInventoriesMapper extends BaseMapper<ProductInventories> {
+}

src/main/java/com/qf/backend/mapper/ProductSkusMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ProductSkus;
+
+/**
+ * 商品SKU表 Mapper 接口
+ */
+public interface ProductSkusMapper extends BaseMapper<ProductSkus> {
+}

src/main/java/com/qf/backend/mapper/ProductsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Products;
+
+/**
+ * 商品基本信息表 Mapper 接口
+ */
+public interface ProductsMapper extends BaseMapper<Products> {
+}

src/main/java/com/qf/backend/mapper/RefundsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Refunds;
+
+/**
+ * 退款信息表 Mapper 接口
+ */
+public interface RefundsMapper extends BaseMapper<Refunds> {
+}

src/main/java/com/qf/backend/mapper/RolePermissionsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.RolePermissions;
+
+/**
+ * 角色-权限关联表 Mapper 接口
+ */
+public interface RolePermissionsMapper extends BaseMapper<RolePermissions> {
+}

src/main/java/com/qf/backend/mapper/RolesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Roles;
+
+/**
+ * 角色信息表 Mapper 接口
+ */
+public interface RolesMapper extends BaseMapper<Roles> {
+}

src/main/java/com/qf/backend/mapper/ShopCategoriesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ShopCategories;
+
+/**
+ * 店铺分类表 Mapper 接口
+ */
+public interface ShopCategoriesMapper extends BaseMapper<ShopCategories> {
+}

src/main/java/com/qf/backend/mapper/ShopRatingsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.ShopRatings;
+
+/**
+ * 店铺评分表 Mapper 接口
+ */
+public interface ShopRatingsMapper extends BaseMapper<ShopRatings> {
+}

src/main/java/com/qf/backend/mapper/ShopsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Shops;
+
+/**
+ * 店铺信息表 Mapper 接口
+ */
+public interface ShopsMapper extends BaseMapper<Shops> {
+}

src/main/java/com/qf/backend/mapper/UserDetailsMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.UserDetails;
+
+/**
+ * 用户详细信息表 Mapper 接口
+ */
+public interface UserDetailsMapper extends BaseMapper<UserDetails> {
+}

src/main/java/com/qf/backend/mapper/UserRolesMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.UserRoles;
+
+/**
+ * 用户-角色关联表 Mapper 接口
+ */
+public interface UserRolesMapper extends BaseMapper<UserRoles> {
+}

src/main/java/com/qf/backend/mapper/UsersMapper.java

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+package com.qf.backend.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.qf.backend.entity.Users;
+
+/**
+ * 用户基本信息表 Mapper 接口
+ */
+public interface UsersMapper extends BaseMapper<Users> {
+}