admin lists: server-side pagination + filters for accounts/users/cdks/showcase/banned-words (limit/offset/total; stats over full set; /showcase/admin flat paginated view; dead=1 accounts filter for bulk dead-delete)

backend/internal/http/handler/cdk.go

@@ -3,6 +3,7 @@ package handler
 import (
 	"errors"
 	"net/http"
+	"strings"
 
 	"backend/internal/model"
 	"backend/internal/service"
@@ -23,7 +24,43 @@ func (h *CDKHandler) List(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"detail": "failed to load cdks"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"data": cdkPublic(items, names), "stats": stats})
+
+	// Server-side filtering (状态 未使用/已使用 · 类型 普通/营销 · 搜索兑换码) + pagination.
+	statusFilter := strings.TrimSpace(c.Query("status")) // "" | active | used
+	typeFilter := strings.TrimSpace(c.Query("type"))     // "" | normal | marketing
+	q := strings.ToUpper(strings.TrimSpace(c.Query("q")))
+	filtered := make([]model.CDKCode, 0, len(items))
+	for _, item := range items {
+		switch statusFilter {
+		case "active":
+			if item.Status != "active" {
+				continue
+			}
+		case "used":
+			if item.Status == "active" {
+				continue
+			}
+		}
+		switch typeFilter {
+		case "marketing":
+			if item.Type != "marketing" {
+				continue
+			}
+		case "normal":
+			if item.Type == "marketing" {
+				continue
+			}
+		}
+		if q != "" && !strings.Contains(strings.ToUpper(item.Code), q) {
+			continue
+		}
+		filtered = append(filtered, item)
+	}
+
+	total := len(filtered)
+	limit, offset := pageParams(c, 20)
+	page := pageSlice(filtered, limit, offset)
+	c.JSON(http.StatusOK, gin.H{"data": cdkPublic(page, names), "total": total, "limit": limit, "offset": offset, "stats": stats})
 }
 
 func (h *CDKHandler) Create(c *gin.Context) {