fix: 添加分类名称唯一约束，防止重复名称

backend/internal/api/handlers/article.go

@@ -5,7 +5,6 @@ import (
 	"net/http"
 	"strconv"
 
-	"sale/internal/crawler"
 	"sale/internal/models"
 	"sale/internal/schemas"
 	"sale/internal/utils"
@@ -164,15 +163,3 @@ func (h *ArticleHandler) TogglePin(c *gin.Context) {
 	utils.DB.First(&article, id)
 	c.JSON(http.StatusOK, gin.H{"data": article})
 }
-
-// CrawlRibenyan 采集 ribenyan.com 文章
-func (h *ArticleHandler) CrawlRibenyan(c *gin.Context) {
-	crawler := crawler.NewRibenyanCrawler(utils.DB)
-	
-	if err := crawler.CrawlArticles(); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
-		return
-	}
-	
-	c.JSON(http.StatusOK, gin.H{"message": "Crawl completed successfully"})
-}