feat(tenpayv2): 新增部分接口

src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Models/Fraud/GetRiskPublicKeyRequest.cs

@@ -0,0 +1,32 @@
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /risk/getpublickey 接口的请求。</para>
+    /// </summary>
+    public class GetRiskPublicKeyRequest : WechatTenpaySignableRequest
+    {
+        /// <summary>
+        /// <inheritdoc/>
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("mch_id")]
+        [System.Text.Json.Serialization.JsonPropertyName("mch_id")]
+        public override string? MerchantId { get; set; }
+
+        /// <summary>
+        /// <inheritdoc/>
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public override string? AppId { get; set; }
+
+        /// <summary>
+        /// <inheritdoc/>
+        /// <para>默认值：<see cref="Constants.SignTypes.MD5"/></para>
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("sign_type")]
+        [System.Text.Json.Serialization.JsonPropertyName("sign_type")]
+#pragma warning disable CS8765
+        public override string SignType { get; set; } = Constants.SignTypes.MD5;
+#pragma warning restore CS8765
+    }
+}

src/SKIT.FlurlHttpClient.Wechat.TenpayV2/Models/Fraud/GetRiskPublicKeyResponse.cs

@@ -0,0 +1,29 @@
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV2.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /risk/getpublickey 接口的响应。</para>
+    /// </summary>
+    public class GetRiskPublicKeyResponse : WechatTenpaySignableResponse
+    {
+        /// <summary>
+        /// <inheritdoc/>
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("mch_id")]
+        [System.Text.Json.Serialization.JsonPropertyName("mch_id")]
+        public override string? MerchantId { get; set; }
+
+        /// <summary>
+        /// <inheritdoc/>
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public override string? AppId { get; set; }
+
+        /// <summary>
+        /// 获取或设置 RSA 公钥。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("pub_key")]
+        [System.Text.Json.Serialization.JsonPropertyName("pub_key")]
+        public string PublicKey { get; set; } = default!;
+    }
+}