更新框架，增加云库搜索模块

Store.KJDWebService/Commons/KJDConfig.cs

@@ -0,0 +1,41 @@
+using Microsoft.Extensions.Configuration;
+
+namespace StoreHub.KJDWebService.Commons
+{
+	/// <summary>
+	/// 业务配置读取（旧 System.Configuration.ConfigurationManager 迁移）。
+	/// 连接串读 ConnectionStrings 节；业务开关读 KJDConfig 节。
+	/// 由宿主 Program.cs 在启动时初始化。
+	/// </summary>
+	public static class KJDConfig
+	{
+		private static IConfiguration _configuration;
+
+		public static void SetConfiguration(IConfiguration configuration)
+		{
+			_configuration = configuration;
+		}
+		public static string GetConnection(string key)
+		{
+			if (_configuration == null)
+				return null;
+			var v = _configuration[$"ConnectionStrings:{key}"];
+			if (!string.IsNullOrEmpty(v))
+				return v;
+			v = _configuration.GetConnectionString(key);
+			return v;
+		}
+		/// <summary>读取配置值（对应旧 connectionStrings["key"].ConnectionString）</summary>
+		public static string Get(string key)
+		{
+			if (_configuration == null)
+				return null;
+			// 优先业务配置节，其次连接串
+			var v = _configuration[$"KJDConfig:{key}"];
+			if (!string.IsNullOrEmpty(v))
+				return v;
+			v = _configuration.GetConnectionString(key);
+			return v;
+		}
+	}
+}