feat: TPS/MSPT/메모리 성능 모니터링 API 추가

- ServerStatus에 tps, mspt, memoryUsedMb, memoryMaxMb 필드 추가
- getMspt() 함수 구현 (averageTickTimeNanos 기반)
- getTps()를 mspt 기반으로 리팩토링

ServerStatus/src/main/kotlin/co/caadiq/serverstatus/data/ServerDataCollector.kt

@@ -22,6 +22,10 @@ class ServerDataCollector {
     /** 전체 서버 상태 수집 */
     fun collectStatus(): ServerStatus {
         val server = getServer()
+        val runtime = Runtime.getRuntime()
+        val memoryUsedMb = (runtime.totalMemory() - runtime.freeMemory()) / 1024 / 1024
+        val memoryMaxMb = runtime.maxMemory() / 1024 / 1024
+        val mspt = getMspt(server)
 
         return ServerStatus(
                 online = server != null,
@@ -29,12 +33,40 @@ class ServerDataCollector {
                 modLoader = getModLoaderInfo(),
                 difficulty = getDifficulty(),
                 uptimeMinutes = getUptimeMinutes(),
+                tps = getTps(mspt),
+                mspt = mspt,
+                memoryUsedMb = memoryUsedMb,
+                memoryMaxMb = memoryMaxMb,
                 players = getPlayersInfo(),
                 gameRules = getGameRules(),
                 mods = getModsList()
         )
     }
 
+    /** MSPT (Milliseconds Per Tick) 계산 */
+    private fun getMspt(server: MinecraftServer?): Double {
+        if (server == null) return 0.0
+        return try {
+            val averageTickTimeNs = server.averageTickTimeNanos
+            val mspt = averageTickTimeNs / 1_000_000.0
+            "%.2f".format(mspt).toDouble()
+        } catch (e: Exception) {
+            0.0
+        }
+    }
+
+    /** TPS (Ticks Per Second) 계산 */
+    private fun getTps(mspt: Double): Double {
+        if (mspt <= 0) return 20.0
+        return try {
+            // TPS = 1000ms / msPerTick, 최대 20
+            val tps = 1000.0 / mspt
+            minOf(tps, 20.0).let { "%.1f".format(it).toDouble() }
+        } catch (e: Exception) {
+            20.0
+        }
+    }
+
     /** 마인크래프트 버전 */
     private fun getMinecraftVersion(): String {
         return try {

ServerStatus/src/main/kotlin/co/caadiq/serverstatus/network/MessageTypes.kt

@@ -10,6 +10,10 @@ data class ServerStatus(
         val modLoader: String,
         val difficulty: String,
         val uptimeMinutes: Long,
+        val tps: Double, // TPS (Ticks Per Second)
+        val mspt: Double, // MSPT (Milliseconds Per Tick)
+        val memoryUsedMb: Long, // 사용 중인 메모리 (MB)
+        val memoryMaxMb: Long, // 최대 메모리 (MB)
         val players: PlayersInfo,
         val gameRules: Map<String, Boolean>,
         val mods: List<ModInfo>