feat(quality-owner): 增加优质号主自助取消与权益校验

backend/internal/modules/qualityowner/handler.go

@@ -2,6 +2,7 @@ package qualityowner
 
 import (
 	"errors"
+	"fmt"
 	"net/http"
 	"strconv"
 
@@ -48,6 +49,24 @@ func (h *Handler) Activate(c *gin.Context) {
 	response.OK(c, item)
 }
 
+func (h *Handler) Cancel(c *gin.Context) {
+	userID, ok := currentUserID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少用户上下文")
+		return
+	}
+	item, err := h.service.Cancel(c.Request.Context(), userID, AuditMeta{
+		IP:        c.ClientIP(),
+		UserAgent: c.GetHeader("User-Agent"),
+		RequestID: middleware.GetRequestID(c),
+	})
+	if err != nil {
+		writeError(c, err)
+		return
+	}
+	response.OK(c, item)
+}
+
 func (h *Handler) AdminSet(c *gin.Context) {
 	adminID, ok := currentAdminID(c)
 	if !ok {
@@ -109,6 +128,15 @@ func writeError(c *gin.Context, err error) {
 		response.Error(c, http.StatusConflict, "quality_owner_payment_pending", "已有待完成的保证金支付，请先完成支付或稍后重试")
 	case errors.Is(err, ErrInactive):
 		response.Error(c, http.StatusConflict, "quality_owner_inactive", "当前不是优质号主")
+	case errors.Is(err, ErrActivePremiumListings):
+		var activeErr ActivePremiumListingsError
+		errors.As(err, &activeErr)
+		response.Error(
+			c,
+			http.StatusConflict,
+			"quality_owner_active_premium_listings",
+			fmt.Sprintf("极品专区还有 %d 个进行中账号，请先下架或完成订单后再取消", activeErr.Count),
+		)
 	case errors.Is(err, ErrInvalidReason):
 		response.BadRequest(c, "请填写 2-200 字的操作原因")
 	case errors.Is(err, gorm.ErrRecordNotFound):