Linux-related stdio fixes and update version (#22)

- Modified `GetCommand` to return OS-specific commands and changed return type to `string?`.
- Improved `InitializeCommand` for better command initialization and logging.
- Cleaned up using directives in `Log.cs` and `SseClientTransport.cs`.
- Updated `CreateNoWindow` property in `StdioClientTransport` to be OS-dependent.
- Bumped version number in `mcpdotnet.csproj` to 1.0.1.1.

src/mcpdotnet/Protocol/Transport/StdioClientTransport.cs

@@ -61,7 +61,7 @@ public sealed class StdioClientTransport : TransportBase, IClientTransport
                 RedirectStandardInput = true,
                 RedirectStandardOutput = true,
                 RedirectStandardError = true,
-                CreateNoWindow = true,
+                CreateNoWindow = OperatingSystem.IsWindows(),
                 WorkingDirectory = _options.WorkingDirectory ?? Environment.CurrentDirectory,
             };