Reorganize SDK source layout

src/BinaryLane.Api/Models/ServerActions/ServerAction.cs

@@ -0,0 +1,44 @@
+using System.Text.Json.Serialization;
+
+namespace BinaryLane.Api.V2.Models;
+
+/// <summary>
+/// Base payload for <c>POST /v2/servers/{server_id}/actions</c>.
+/// </summary>
+/// <remarks>
+/// The upstream contract is a discriminated union on <c>type</c>. Its public
+/// documentation also creates fragment-bearing pseudo-paths for each variant;
+/// those are not separate HTTP routes. Prefer a concrete derived type for a
+/// documented action. <see cref="UnknownServerAction"/> permits new provider
+/// action types without waiting for an SDK release.
+/// </remarks>
+public class ServerAction : BinaryLaneRequestModel
+{
+    /// <summary>Creates an empty action for serializers and advanced callers.</summary>
+    public ServerAction()
+    {
+    }
+
+    /// <summary>Creates a typed action with the provider discriminator value.</summary>
+    protected ServerAction(string type)
+    {
+        Type = type;
+    }
+
+    [JsonPropertyName(ServerActionJsonNames.Type)]
+    public string Type { get; init; } = string.Empty;
+}
+
+internal static class ServerActionJsonNames
+{
+    internal const string Type = "type";
+}
+
+/// <summary>An action type not yet represented by a concrete SDK class.</summary>
+public sealed class UnknownServerAction : ServerAction
+{
+    public UnknownServerAction(string type)
+        : base(type)
+    {
+    }
+}