更新框架，增加云库搜索模块

Models/CloudProduct/ImportConverters/ConverterToGoodsFactory.cs

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+using Store.Modules.CloudProduct.Entities;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Store.Modules.CloudProduct.ImportConverters
+{
+	/// <summary>
+	/// 导入商品转换工厂：按顺序尝试各转换器，返回标准商品模型。
+	/// </summary>
+	public class ConverterToGoodsFactory
+	{
+		private static readonly List<IGoodsConverter> _converters = new List<IGoodsConverter>
+		{
+			new ConverterV1(),
+		};
+
+		/// <summary>
+		/// 根据本地 JSON 文件路径转换。
+		/// </summary>
+		public static ProductEntity? Convert(string filePath)
+		{
+			if (string.IsNullOrWhiteSpace(filePath))
+				throw new ArgumentNullException(nameof(filePath));
+
+			if (!File.Exists(filePath))
+				throw new FileNotFoundException("找不到导入文件", filePath);
+
+			string content = File.ReadAllText(filePath);
+			return ConvertContent(content);
+		}
+
+		/// <summary>
+		/// 根据 JSON 内容字符串转换。
+		/// </summary>
+		public static ProductEntity? ConvertContent(string content)
+		{
+			if (string.IsNullOrWhiteSpace(content))
+				throw new ArgumentNullException(nameof(content));
+
+			foreach (IGoodsConverter item in _converters)
+			{
+				item.ReadContent(content);
+				if (item.IsMatch())
+				{
+					var goods = item.Convert();
+					if (goods != null)
+						return goods;
+				}
+			}
+
+			return null;
+		}
+	}
+}