feat(pricing): 添加查询接口并优化配置管理

- 新增多个查询接口，包括商品配置、阶梯配置和一口价配置的查询- 优化配置管理逻辑，支持 default 配置的创建和使用
- 重构部分代码，提高可维护性和可扩展性

src/main/java/com/ycwl/basic/pricing/mapper/PriceBundleConfigMapper.java

@@ -41,7 +41,7 @@ public interface PriceBundleConfigMapper extends BaseMapper<PriceBundleConfig> {
      */
     @Insert("INSERT INTO price_bundle_config (bundle_name, scenic_id, bundle_price, included_products, excluded_products, " +
             "description, is_active, created_time, updated_time) VALUES " +
-            "(#{bundleName}, #{scenicId}, #{bundlePrice}, #{includedProducts}, #{excludedProducts}, " +
+            "(#{bundleName}, #{scenicId}, #{bundlePrice}, #{includedProducts,typeHandler=com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler}, #{excludedProducts,typeHandler=com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler}, " +
             "#{description}, #{isActive}, NOW(), NOW())")
     int insertBundleConfig(PriceBundleConfig config);
     
@@ -49,7 +49,7 @@ public interface PriceBundleConfigMapper extends BaseMapper<PriceBundleConfig> {
      * 更新一口价配置
      */
     @Update("UPDATE price_bundle_config SET bundle_name = #{bundleName}, scenic_id = #{scenicId}, bundle_price = #{bundlePrice}, " +
-            "included_products = #{includedProducts}, excluded_products = #{excludedProducts}, " +
+            "included_products = #{includedProducts,typeHandler=com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler}, excluded_products = #{excludedProducts,typeHandler=com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler}, " +
             "description = #{description}, is_active = #{isActive}, updated_time = NOW() WHERE id = #{id}")
     int updateBundleConfig(PriceBundleConfig config);
     

src/main/java/com/ycwl/basic/pricing/mapper/PriceProductConfigMapper.java

@@ -34,6 +34,12 @@ public interface PriceProductConfigMapper extends BaseMapper<PriceProductConfig>
     @Select("SELECT * FROM price_product_config WHERE product_type = #{productType} AND product_id = #{productId} AND is_active = 1")
     PriceProductConfig selectByProductTypeAndId(String productType, String productId);
     
+    /**
+     * 检查是否存在default配置（包含禁用的）
+     */
+    @Select("SELECT COUNT(*) FROM price_product_config WHERE product_type = #{productType} AND product_id = 'default'")
+    int countDefaultConfigsByProductType(@Param("productType") String productType);
+    
     // ==================== 管理端接口（包含禁用的配置） ====================
     
     /**

src/main/java/com/ycwl/basic/pricing/mapper/PriceTierConfigMapper.java

@@ -49,6 +49,12 @@ public interface PriceTierConfigMapper extends BaseMapper<PriceTierConfig> {
     @Select("SELECT * FROM price_tier_config WHERE is_active = 1 ORDER BY product_type ASC, sort_order ASC")
     List<PriceTierConfig> selectAllActiveConfigs();
     
+    /**
+     * 检查是否存在default阶梯配置（包含禁用的）
+     */
+    @Select("SELECT COUNT(*) FROM price_tier_config WHERE product_type = #{productType} AND product_id = 'default'")
+    int countDefaultTierConfigsByProductType(@Param("productType") String productType);
+    
     // ==================== 管理端接口（包含禁用的配置） ====================
     
     /**