feat: 添加作品购买人列表功能

backend_v1/app/http/admin/posts.go

@@ -195,6 +195,21 @@ func (ctl *posts) Show(ctx fiber.Ctx, post *models.Post) (*PostItem, error) {
 	}, nil
 }
 
+// Buyers
+//
+//	@Summary	作品购买人列表
+//	@Tags		Admin Posts
+//	@Produce	json
+//	@Param		id			path		int64								true	"作品 ID"
+//	@Param		pagination	query		requests.Pagination					false	"分页参数"
+//	@Success	200			{object}	requests.Pager{items=dto.PostBuyerItem}	"成功"
+//	@Router		/admin/v1/posts/:id/buyers [get]
+//	@Bind		post path key(id) model(id)
+//	@Bind		pagination query
+func (ctl *posts) Buyers(ctx fiber.Ctx, post *models.Post, pagination *requests.Pagination) (*requests.Pager, error) {
+	return services.Posts.Buyers(ctx, post.ID, pagination)
+}
+
 // SendTo
 //
 //	@Summary	赠送作品给用户