refactor(backend): 引入端口接口模式

backend/internal/service/ports/redeem_code.go

@@ -0,0 +1,22 @@
+package ports
+
+import (
+	"context"
+
+	"sub2api/internal/model"
+	"sub2api/internal/pkg/pagination"
+)
+
+type RedeemCodeRepository interface {
+	Create(ctx context.Context, code *model.RedeemCode) error
+	CreateBatch(ctx context.Context, codes []model.RedeemCode) error
+	GetByID(ctx context.Context, id int64) (*model.RedeemCode, error)
+	GetByCode(ctx context.Context, code string) (*model.RedeemCode, error)
+	Update(ctx context.Context, code *model.RedeemCode) error
+	Delete(ctx context.Context, id int64) error
+	Use(ctx context.Context, id, userID int64) error
+
+	List(ctx context.Context, params pagination.PaginationParams) ([]model.RedeemCode, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, codeType, status, search string) ([]model.RedeemCode, *pagination.PaginationResult, error)
+	ListByUser(ctx context.Context, userID int64, limit int) ([]model.RedeemCode, error)
+}