Initial project snapshot

workers/rdp-service-csharp/src/Rap.Rdp.Service/Program.cs

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+using Rap.Rdp.Core;
+
+Console.WriteLine("RAP RDP C# service skeleton");
+Console.WriteLine("Status: protocol engine not implemented; current C++ worker remains active.");
+Console.WriteLine($"WorkerId={Environment.GetEnvironmentVariable("RDP_SERVICE_WORKER_ID") ?? "rdp-worker-csharp-1"}");
+
+if (args.Contains("--self-test", StringComparer.OrdinalIgnoreCase))
+{
+    var descriptor = new RdpSessionDescriptor(
+        "self-test-session",
+        "self-test-attachment",
+        "self-test-org",
+        "self-test-resource",
+        "rdp-worker-csharp-1",
+        new RdpTargetEndpoint("127.0.0.1", 3389, "user", "password"),
+        new RdpSecurityPolicy(CertificateVerificationMode.Strict),
+        new RdpRuntimePolicy(
+            new HashSet<RapChannel> { RapChannel.Control, RapChannel.Input, RapChannel.Render },
+            ClipboardMode.Disabled,
+            FileTransferMode.Disabled));
+
+    Console.WriteLine($"Self-test descriptor created for session={descriptor.SessionId}");
+    return;
+}
+
+Console.WriteLine("Use --self-test to validate skeleton startup.");

workers/rdp-service-csharp/src/Rap.Rdp.Service/Rap.Rdp.Service.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Rap.Rdp.Core\Rap.Rdp.Core.csproj" />
+  </ItemGroup>
+</Project>