feat(tenpayv3): 新增获取分账账单相关接口

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/ProfitSharing/Bills/GetProfitSharingBillRequest.cs

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+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /profitsharing/bills 接口的请求。</para>
+    /// </summary>
+    public class GetProfitSharingBillRequest : WechatTenpayRequest
+    {
+        /// <summary>
+        /// 获取或设置子商户号。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string? SubMerchantId { get; set; }
+
+        /// <summary>
+        /// 获取或设置账单日期（格式：yyyy-MM-dd）。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string BillDateString { get; set; } = string.Empty;
+
+        /// <summary>
+        /// 获取或设置压缩类型。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string? TarType { get; set; }
+    }
+}

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/ProfitSharing/Bills/GetProfitSharingBillResponse.cs

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+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /profitsharing/bills 接口的响应。</para>
+    /// </summary>
+    public class GetProfitSharingBillResponse : WechatTenpayResponse
+    {
+        /// <summary>
+        /// 获取或设置哈希类型。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("hash_type")]
+        [System.Text.Json.Serialization.JsonPropertyName("hash_type")]
+        public string HashType { get; set; } = default!;
+
+        /// <summary>
+        /// 获取或设置哈希值。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("hash_value")]
+        [System.Text.Json.Serialization.JsonPropertyName("hash_value")]
+        public string HashValue { get; set; } = default!;
+
+        /// <summary>
+        /// 获取或设置账单下载地址。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("download_url")]
+        [System.Text.Json.Serialization.JsonPropertyName("download_url")]
+        public string DownloadUrl { get; set; } = default!;
+    }
+}