feat(service): add ServiceCommands skeleton with platform/admin gates

src/ClaudeMailbox/Cli/ServiceCommands.cs

@@ -0,0 +1,99 @@
+using System.Diagnostics;
+using System.Runtime.Versioning;
+using System.Security.Principal;
+
+namespace ClaudeMailbox.Cli;
+
+public static class ServiceCommands
+{
+    public const string ServiceName = "ClaudeMailbox";
+
+    public static Task<int> RunAsync(string[] args)
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            Console.Error.WriteLine("Service commands are Windows-only.");
+            return Task.FromResult(2);
+        }
+
+        var verb = args[0];
+        return verb switch
+        {
+            "install-service"   => Task.FromResult(InstallService(args)),
+            "uninstall-service" => Task.FromResult(UninstallService(args)),
+            "start"             => Task.FromResult(RunSc("start", ServiceName)),
+            "stop"              => Task.FromResult(RunSc("stop", ServiceName)),
+            "status"            => Task.FromResult(Status()),
+            _ => Task.FromResult(PrintError($"Unknown service command: {verb}")),
+        };
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static bool IsAdministrator()
+    {
+        using var identity = WindowsIdentity.GetCurrent();
+        return new WindowsPrincipal(identity).IsInRole(WindowsBuiltInRole.Administrator);
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static int RequireAdmin()
+    {
+        if (IsAdministrator()) return 0;
+        Console.Error.WriteLine("This command requires Administrator privileges.");
+        return 5;
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static int InstallService(string[] args)
+    {
+        var admin = RequireAdmin();
+        if (admin != 0) return admin;
+
+        Console.Error.WriteLine("install-service: not yet implemented.");
+        return 1;
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static int UninstallService(string[] args)
+    {
+        var admin = RequireAdmin();
+        if (admin != 0) return admin;
+
+        Console.Error.WriteLine("uninstall-service: not yet implemented.");
+        return 1;
+    }
+
+    [SupportedOSPlatform("windows")]
+    private static int Status()
+    {
+        Console.Error.WriteLine("status: not yet implemented.");
+        return 1;
+    }
+
+    [SupportedOSPlatform("windows")]
+    internal static int RunSc(params string[] scArgs)
+    {
+        var psi = new ProcessStartInfo("sc.exe")
+        {
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            UseShellExecute = false,
+        };
+        foreach (var a in scArgs) psi.ArgumentList.Add(a);
+
+        using var proc = Process.Start(psi)!;
+        var stdout = proc.StandardOutput.ReadToEnd();
+        var stderr = proc.StandardError.ReadToEnd();
+        proc.WaitForExit();
+
+        if (!string.IsNullOrWhiteSpace(stdout)) Console.Write(stdout);
+        if (!string.IsNullOrWhiteSpace(stderr)) Console.Error.Write(stderr);
+        return proc.ExitCode;
+    }
+
+    private static int PrintError(string msg)
+    {
+        Console.Error.WriteLine(msg);
+        return 1;
+    }
+}