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/Common/FileUtils.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <string>
+
+namespace ServerRuntime
+{
+	namespace FileUtils
+	{
+		/**
+		 * Reads the full UTF-8 path target into memory without interpreting JSON or line endings
+		 * UTF-8パスのテキストファイル全体をそのまま読み込む
+		 */
+		bool ReadTextFile(const std::string &filePath, std::string *outText);
+		/**
+		 * Writes text through a same-directory temporary file and publishes it with a single replacement step
+		 * 同一ディレクトリの一時ファイル経由で安全に書き換える
+		 */
+		bool WriteTextFileAtomic(const std::string &filePath, const std::string &text);
+		/**
+		 * Returns the current UTC timestamp encoded in Windows FILETIME units for expiry comparisons
+		 * 期限判定用に現在UTC時刻をWindows FILETIME単位で返す
+		 */
+		unsigned long long GetCurrentUtcFileTime();
+	}
+}