feat: add smartcmd dedicated server

major bug: when connecting to the server a second time, it gets softlocked and keeps repeating ticking connection A\n in debug logs until it times out.

Minecraft.Server/Console/ServerCliInput.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <atomic>
+#include <thread>
+
+struct linenoiseCompletions;
+
+namespace ServerRuntime
+{
+	class ServerCliEngine;
+
+	/**
+	 * **CLI input worker**
+	 *
+	 * Owns the interactive input thread and bridges linenoise callbacks to the engine.
+	 * 入力スレッドと補完コールバックを管理するクラス
+	 */
+	class ServerCliInput
+	{
+	public:
+		ServerCliInput();
+		~ServerCliInput();
+
+		/**
+		 * **Start input loop**
+		 *
+		 * Binds to an engine and starts reading user input from the console.
+		 * エンジンに接続して入力ループを開始
+		 */
+		void Start(ServerCliEngine *engine);
+
+		/**
+		 * **Stop input loop**
+		 *
+		 * Requests stop and joins the input thread.
+		 * 停止要求を出して入力スレッドを終了
+		 */
+		void Stop();
+
+		/**
+		 * **Check running state**
+		 *
+		 * Returns true while the input thread is active.
+		 * 入力処理が動作中かどうか
+		 */
+		bool IsRunning() const;
+
+	private:
+		void RunInputLoop();
+		void RunLinenoiseLoop();
+		void RunStreamInputLoop();
+		void EnqueueLine(const char *line);
+		static void CompletionThunk(const char *line, linenoiseCompletions *completions);
+		void BuildCompletions(const char *line, linenoiseCompletions *completions);
+
+	private:
+		std::atomic<bool> m_running;
+		std::thread m_inputThread;
+		ServerCliEngine *m_engine;
+
+		static ServerCliInput *s_instance;
+	};
+}