fix: HUD去日志+空列表return，服务端每5秒定期同步榜单数据

src/main/java/com/github/zly2006/carpetslsaddition/client/BoardHudElement.java

@@ -28,7 +28,6 @@ public class BoardHudElement implements HudElement {
     @Override
     public void extractRenderState(GuiGraphicsExtractor g, DeltaTracker delta) {
         String board = BoardClientState.displaying;
-        com.github.zly2006.carpetslsaddition.ServerMain.LOGGER.info("[SLSA-HUD] extractRenderState board={}", board);
         if (board == null || board.isEmpty()) {
             return;
         }
@@ -37,6 +36,9 @@ public class BoardHudElement implements HudElement {
             return;
         }
         List<BoardClientState.Entry> list = BoardClientState.current();
+        if (list.isEmpty()) {
+            return;
+        }
         Font font = mc.font;
 
         String title = BoardClientState.currentTitle();

src/main/java/com/github/zly2006/carpetslsaddition/util/BoardSyncManager.java

@@ -85,13 +85,22 @@ public final class BoardSyncManager {
     }
 
     private static volatile Boolean lastEnabled = null;
+    private static long lastSyncTick = 0;
 
-    /** 由轮询线程每秒调用：规则值变化时同步给所有玩家。 */
+    /** 由轮询线程每秒调用：规则值变化时立即同步；否则每 5 秒定期同步一次数据。 */
     public static void tick(MinecraftServer server) {
         boolean now = com.github.zly2006.carpetslsaddition.SLSCarpetSettings.slsBoardEnabled;
         if (lastEnabled == null || lastEnabled != now) {
             lastEnabled = now;
             syncToAll(server);
+            return;
+        }
+        if (now) {
+            long tick = server.getTickCount();
+            if (tick - lastSyncTick >= 100) {  // 每 100 tick（5秒）同步一次数据
+                lastSyncTick = tick;
+                syncToAll(server);
+            }
         }
     }
 }