修复(#79): 促销管理后台API + 审查问题修复

- 实现促销管理接口：规则CRUD、优惠价配置、使用记录查询
- 修复 UpsertPrices 新增记录时提前 return 的问题
- DeleteRule/DeletePrice 不存在记录返回 code=404
- SetPromoPriceRequest.items 空数组校验
- 分页参数限制 page>0、1<=size<=200
- 下单侧促销价格按数量档总价口径计算（含 #87 修复）

Co-authored-by: multica-agent <github@multica.ai>

internal/types/promo_validation_test.go

@@ -0,0 +1,58 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/go-playground/validator/v10"
+)
+
+func TestPromoPriceItemsMustNotBeEmpty(t *testing.T) {
+	validate := validator.New()
+	req := SetPromoPriceRequest{
+		PromoRuleId: 1,
+		Items:       []PromoPriceItem{},
+	}
+
+	if err := validate.Struct(req); err == nil {
+		t.Fatal("expected empty promo price items to fail validation")
+	}
+}
+
+func TestPromoListPageSizeLimit(t *testing.T) {
+	validate := validator.New()
+	tests := []struct {
+		name string
+		req  any
+	}{
+		{
+			name: "rule list",
+			req: GetPromoRuleListRequest{
+				Page: 1,
+				Size: 201,
+			},
+		},
+		{
+			name: "price list",
+			req: GetPromoPriceListRequest{
+				PromoRuleId: 1,
+				Page:        1,
+				Size:        201,
+			},
+		},
+		{
+			name: "usage list",
+			req: GetPromoUsageListRequest{
+				Page: 1,
+				Size: 201,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := validate.Struct(tt.req); err == nil {
+				t.Fatal("expected page size greater than 200 to fail validation")
+			}
+		})
+	}
+}

internal/types/types.go

@@ -316,6 +316,45 @@ type ContactRequest struct {
 	Notes        string `json:"notes" validate:"max=2000"`
 }
 
+type PromoPrice struct {
+	Id          int64 `json:"id"`
+	SubscribeId int64 `json:"subscribe_id"`
+	PromoRuleId int64 `json:"promo_rule_id"`
+	Quantity    int64 `json:"quantity"`
+	PromoPrice  int64 `json:"promo_price"`
+	CreatedAt   int64 `json:"created_at"`
+	UpdatedAt   int64 `json:"updated_at"`
+}
+
+type PromoPriceItem struct {
+	SubscribeId int64 `json:"subscribe_id" validate:"required,gt=0"`
+	Quantity    int64 `json:"quantity" validate:"required,gt=0,lte=1000"`
+	PromoPrice  int64 `json:"promo_price" validate:"required,gt=0"`
+}
+
+type PromoRule struct {
+	Id        int64                  `json:"id"`
+	Name      string                 `json:"name"`
+	Type      string                 `json:"type"`
+	Params    map[string]interface{} `json:"params"`
+	Priority  int64                  `json:"priority"`
+	Enabled   bool                   `json:"enabled"`
+	StartTime *int64                 `json:"start_time"`
+	EndTime   *int64                 `json:"end_time"`
+	CreatedAt int64                  `json:"created_at"`
+	UpdatedAt int64                  `json:"updated_at"`
+}
+
+type PromoUsage struct {
+	Id          int64  `json:"id"`
+	UserId      int64  `json:"user_id"`
+	PromoRuleId int64  `json:"promo_rule_id"`
+	SubscribeId int64  `json:"subscribe_id"`
+	OrderNo     string `json:"order_no"`
+	PromoPrice  int64  `json:"promo_price"`
+	CreatedAt   int64  `json:"created_at"`
+}
+
 type Coupon struct {
 	Id         int64   `json:"id"`
 	Name       string  `json:"name"`
@@ -375,6 +414,16 @@ type CreateCouponRequest struct {
 	Enable     *bool   `json:"enable,omitempty"`
 }
 
+type CreatePromoRuleRequest struct {
+	Name      string                 `json:"name" validate:"required,max=100"`
+	Type      string                 `json:"type" validate:"required,oneof=new_user inactive_user campaign"`
+	Params    map[string]interface{} `json:"params"`
+	Priority  int64                  `json:"priority" validate:"gte=0"`
+	Enabled   *bool                  `json:"enabled"`
+	StartTime *int64                 `json:"start_time"`
+	EndTime   *int64                 `json:"end_time"`
+}
+
 type CreateDocumentRequest struct {
 	Title   string   `json:"title" validate:"required"`
 	Content string   `json:"content" validate:"required"`
@@ -1096,6 +1145,48 @@ type GetCouponListResponse struct {
 	List  []Coupon `json:"list"`
 }
 
+type GetPromoPriceListRequest struct {
+	PromoRuleId int64 `form:"promo_rule_id" validate:"required,gt=0"`
+	Page        int64 `form:"page" validate:"required,gt=0"`
+	Size        int64 `form:"size" validate:"required,gt=0,lte=200"`
+}
+
+type GetPromoPriceListResponse struct {
+	Total int64        `json:"total"`
+	List  []PromoPrice `json:"list"`
+}
+
+type GetPromoRuleDetailRequest struct {
+	Id int64 `uri:"id" validate:"required,gt=0"`
+}
+
+type GetPromoRuleListRequest struct {
+	Page    int64  `form:"page" validate:"required,gt=0"`
+	Size    int64  `form:"size" validate:"required,gt=0,lte=200"`
+	Type    string `form:"type" validate:"omitempty,oneof=new_user inactive_user campaign"`
+	Enabled *bool  `form:"enabled"`
+	Search  string `form:"search,omitempty"`
+}
+
+type GetPromoRuleListResponse struct {
+	Total int64       `json:"total"`
+	List  []PromoRule `json:"list"`
+}
+
+type GetPromoUsageListRequest struct {
+	Page        int64  `form:"page" validate:"required,gt=0"`
+	Size        int64  `form:"size" validate:"required,gt=0,lte=200"`
+	RuleId      int64  `form:"rule_id,omitempty"`
+	UserId      int64  `form:"user_id,omitempty"`
+	SubscribeId int64  `form:"subscribe_id,omitempty"`
+	OrderNo     string `form:"order_no,omitempty"`
+}
+
+type GetPromoUsageListResponse struct {
+	Total int64        `json:"total"`
+	List  []PromoUsage `json:"list"`
+}
+
 type GetDetailRequest struct {
 	Id int64 `form:"id" validate:"required"`
 }
@@ -3130,6 +3221,30 @@ type UpdateCouponRequest struct {
 	Enable     *bool   `json:"enable,omitempty"`
 }
 
+type SetPromoPriceRequest struct {
+	PromoRuleId int64            `json:"promo_rule_id" validate:"required,gt=0"`
+	Items       []PromoPriceItem `json:"items" validate:"required,min=1,dive"`
+}
+
+type DeletePromoPriceRequest struct {
+	Id int64 `uri:"id" validate:"required,gt=0"`
+}
+
+type DeletePromoRuleRequest struct {
+	Id int64 `uri:"id" validate:"required,gt=0"`
+}
+
+type UpdatePromoRuleRequest struct {
+	Id        int64                  `uri:"id" validate:"required,gt=0"`
+	Name      string                 `json:"name" validate:"required,max=100"`
+	Type      string                 `json:"type" validate:"required,oneof=new_user inactive_user campaign"`
+	Params    map[string]interface{} `json:"params"`
+	Priority  int64                  `json:"priority" validate:"gte=0"`
+	Enabled   *bool                  `json:"enabled"`
+	StartTime *int64                 `json:"start_time"`
+	EndTime   *int64                 `json:"end_time"`
+}
+
 type UpdateDocumentRequest struct {
 	Id      int64    `json:"id" validate:"required"`
 	Title   string   `json:"title" validate:"required"`