fix(backend): 店铺公开页分享卡片标题去掉「岩美酒库」尾缀

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJ1g8XV1YhhmHRzhwWEW7o

backend/internal/handler/public_page.go

@@ -310,7 +310,7 @@ func (h *PublicHandler) ShopPage(c *gin.Context) {
 	}
 
 	vm := shopPageVM{
-		PageTitle: shop.Name + " · 在售商品 · 岩美酒库",
+		PageTitle: shop.Name + " · 在售商品",
 		OGTags:    template.HTML(buildShopOG(shop, total, config.C.Storage.PublicURL)), // #nosec G203 -- buildShopOG 内部对所有值 html.EscapeString
 		Found:     true,
 		ShopName:  shop.Name,