feat: 实现订单支付功能模块

- 新增订单管理、支付回调、购买验证等核心服务
- 实现订单、订单项目的数据存储层和 API 接口
- 添加订单数据库迁移和 DTO 定义
- 更新 API 文档和路由配置
- 同步 3 个新规范到主规范库（订单管理、订单支付、套餐购买验证）
- 完成 OpenSpec 变更归档

Ultraworked with Sisyphus

cmd/gendocs/main.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/break/junhong_cmp_fiber/internal/bootstrap"
 	"github.com/break/junhong_cmp_fiber/internal/handler/admin"
+	"github.com/break/junhong_cmp_fiber/internal/handler/callback"
 	"github.com/break/junhong_cmp_fiber/internal/handler/h5"
 	"github.com/break/junhong_cmp_fiber/internal/routes"
 	"github.com/break/junhong_cmp_fiber/pkg/openapi"
@@ -59,6 +60,9 @@ func generateAdminDocs(outputPath string) error {
 		Package:                     admin.NewPackageHandler(nil),
 		ShopSeriesAllocation:        admin.NewShopSeriesAllocationHandler(nil),
 		ShopPackageAllocation:       admin.NewShopPackageAllocationHandler(nil),
+		AdminOrder:                  admin.NewOrderHandler(nil),
+		H5Order:                     h5.NewOrderHandler(nil),
+		PaymentCallback:             callback.NewPaymentHandler(nil),
 	}
 
 	// 4. 注册所有路由到文档生成器