add aesbody for get aes cryptbody

ModelBinders/AesBodyProviderBase.cs

@@ -0,0 +1,17 @@
+namespace SimApi.ModelBinders;
+
+/// <summary>
+/// 密钥提供器接口（抽象密钥获取逻辑）
+/// </summary>
+public abstract class AesBodyProviderBase
+{
+    public string? AppIdName { get; set; } = "appId";
+
+
+    /// <summary>
+    /// 根据appId获取对应的密钥
+    /// </summary>
+    /// <param name="appId">应用ID</param>
+    /// <returns>密钥（返回null表示获取失败）</returns>
+    public abstract string? GetKey(string? appId);
+}