chore: 初始化项目基础文件

src/Modules/TakeoutSaaS.Module.Identity/Abstractions/IWeChatAuthService.cs

@@ -0,0 +1,23 @@
+namespace TakeoutSaaS.Module.Identity.Abstractions;
+
+/// <summary>
+/// 微信登录服务抽象（code2Session）
+/// </summary>
+public interface IWeChatAuthService
+{
+    /// <summary>
+    /// 使用小程序登录 code 换取 openid/unionid/session_key
+    /// </summary>
+    Task<WeChatSessionInfo> Code2SessionAsync(string code, CancellationToken cancellationToken = default);
+}
+
+/// <summary>
+/// 微信会话信息
+/// </summary>
+public sealed class WeChatSessionInfo
+{
+    public string OpenId { get; init; } = string.Empty;
+    public string? UnionId { get; init; }
+    public string SessionKey { get; init; } = string.Empty;
+}
+