feat: 加slsBoardEnabled规则作榜单总开关（服务端规则控制客户端命令）

BoardTogglePayload同步开关状态；客户端/slsboard检查enabled，未开启则拒绝。ServerMain加轮询线程检测规则变化。

src/main/java/com/github/zly2006/carpetslsaddition/SLSCarpetSettings.java

@@ -80,4 +80,7 @@ public class SLSCarpetSettings {
 
     @Rule(categories = {SLSA, RuleCategory.FEATURE})
     public static boolean stackableVehicles = false;
+
+    @Rule(categories = {SLSA, RuleCategory.FEATURE})
+    public static boolean slsBoardEnabled = false;
 }

src/main/java/com/github/zly2006/carpetslsaddition/ServerMain.java

@@ -44,6 +44,7 @@ public class ServerMain implements ModInitializer, CarpetExtension {
         INSTANCE = this;
         CarpetServer.manageExtension(this);
         com.github.zly2006.carpetslsaddition.net.BoardSyncPayload.register();
+        com.github.zly2006.carpetslsaddition.net.BoardTogglePayload.register();
         // 玩家加入时同步榜单
         net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.JOIN.register(
                 (handler, sender, srv) ->
@@ -60,6 +61,25 @@ public class ServerMain implements ModInitializer, CarpetExtension {
         ServerMain.server = server;
         com.github.zly2006.carpetslsaddition.util.BotListManager.load();
         com.github.zly2006.carpetslsaddition.util.BoardSyncManager.syncToAll(server);
+        startBoardWatcher(server);
+    }
+
+    /** 每秒检测 slsBoardEnabled 规则变化并同步给客户端。 */
+    private void startBoardWatcher(MinecraftServer server) {
+        Thread t = new Thread(() -> {
+            while (!Thread.currentThread().isInterrupted()) {
+                try {
+                    com.github.zly2006.carpetslsaddition.util.BoardSyncManager.tick(server);
+                    Thread.sleep(1000L);
+                } catch (InterruptedException e) {
+                    return;
+                } catch (Throwable ex) {
+                    LOGGER.debug("[SLSA] board watcher error: {}", ex.toString());
+                }
+            }
+        }, "SLSA-BoardWatcher");
+        t.setDaemon(true);
+        t.start();
     }
 
     @Override

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

@@ -1,6 +1,7 @@
 package com.github.zly2006.carpetslsaddition.client;
 
 import com.github.zly2006.carpetslsaddition.net.BoardSyncPayload;
+import com.github.zly2006.carpetslsaddition.net.BoardTogglePayload;
 import com.mojang.brigadier.arguments.StringArgumentType;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.api.EnvType;
@@ -38,24 +39,27 @@ public class BoardClient implements ClientModInitializer {
             context.client().execute(() -> BoardClientState.setBoard(payload.board(), entries));
         });
 
+        // 接收开关状态
+        ClientPlayNetworking.registerGlobalReceiver(BoardTogglePayload.TYPE, (payload, context) -> {
+            context.client().execute(() -> BoardClientState.enabled = payload.enabled());
+        });
+
         // 2) /slsboard 命令（纯客户端，非 OP 也能用）
         ClientCommandRegistrationCallback.EVENT.register((dispatcher, registryAccess) -> {
             dispatcher.register(
                     ClientCommands.literal("slsboard")
                             .then(ClientCommands.literal("deaths")
-                                    .executes(c -> { BoardClientState.toggle("deaths"); feedback(c.getSource()); return 1; }))
+                                    .executes(c -> run(c.getSource(), () -> BoardClientState.toggle("deaths"))))
                             .then(ClientCommands.literal("mined")
-                                    .executes(c -> { BoardClientState.toggle("mined"); feedback(c.getSource()); return 1; }))
+                                    .executes(c -> run(c.getSource(), () -> BoardClientState.toggle("mined"))))
                             .then(ClientCommands.literal("off")
-                                    .executes(c -> { BoardClientState.set(""); feedback(c.getSource()); return 1; }))
+                                    .executes(c -> run(c.getSource(), () -> BoardClientState.set(""))))
                             .then(ClientCommands.argument("board", StringArgumentType.word())
                                     .suggests((c, b) -> SharedSuggestionProvider.suggest(
                                             new String[]{"deaths", "mined", "off"}, b))
                                     .executes(c -> {
                                         String v = StringArgumentType.getString(c, "board");
-                                        BoardClientState.set("off".equals(v) ? "" : v);
-                                        feedback(c.getSource());
-                                        return 1;
+                                        return run(c.getSource(), () -> BoardClientState.set("off".equals(v) ? "" : v));
                                     }))
             );
         });
@@ -64,8 +68,15 @@ public class BoardClient implements ClientModInitializer {
         HudElementRegistry.addLast(HUD_ID, new BoardHudElement());
     }
 
-    private static void feedback(FabricClientCommandSource source) {
+    /** 统一的命令入口：先检查服务端开关，再执行动作。 */
+    private static int run(FabricClientCommandSource source, Runnable action) {
+        if (!BoardClientState.enabled) {
+            source.sendError(Component.literal("[SLSA] 榜单功能未开启（服务端 /carpet slsBoardEnabled true）"));
+            return 0;
+        }
+        action.run();
         String d = BoardClientState.displaying;
         source.sendFeedback(Component.literal("[SLSA] 榜单显示：" + (d.isEmpty() ? "关闭" : d)));
+        return 1;
     }
 }

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

@@ -19,6 +19,9 @@ public final class BoardClientState {
     /** 当前显示的榜："" / "deaths" / "mined"。 */
     public static volatile String displaying = "";
 
+    /** 服务端 Carpet 规则 slsBoardEnabled 的状态（未开启则禁止使用）。 */
+    public static volatile boolean enabled = false;
+
     private static volatile List<Entry> deaths = Collections.emptyList();
     private static volatile List<Entry> mined = Collections.emptyList();
 

src/main/java/com/github/zly2006/carpetslsaddition/net/BoardTogglePayload.java

@@ -0,0 +1,31 @@
+package com.github.zly2006.carpetslsaddition.net;
+
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
+
+/**
+ * 服务端 → 客户端：榜单功能总开关状态（对应 Carpet 规则 {@code slsBoardEnabled}）。
+ *
+ * <p>规则变化时下发；客户端收到后决定 {@code /slsboard} 是否可用。
+ */
+public record BoardTogglePayload(boolean enabled) implements CustomPacketPayload {
+
+    public static final CustomPacketPayload.Type<BoardTogglePayload> TYPE =
+            CustomPacketPayload.createType("slsa:board_toggle");
+
+    public static final StreamCodec<RegistryFriendlyByteBuf, BoardTogglePayload> CODEC = StreamCodec.composite(
+            ByteBufCodecs.BOOL, BoardTogglePayload::enabled,
+            BoardTogglePayload::new
+    );
+
+    @Override
+    public CustomPacketPayload.Type<? extends CustomPacketPayload> type() {
+        return TYPE;
+    }
+
+    public static void register() {
+        net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry.clientboundPlay().register(TYPE, CODEC);
+    }
+}

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

@@ -61,12 +61,18 @@ public final class BoardSyncManager {
         return list;
     }
 
-    /** 把两个榜单都同步给某玩家。 */
+    /** 把两个榜单 + 开关状态同步给某玩家。 */
     public static void syncTo(ServerPlayer player) {
         MinecraftServer server = ServerMain.server;
         if (server == null) {
             return;
         }
+        boolean enabled = com.github.zly2006.carpetslsaddition.SLSCarpetSettings.slsBoardEnabled;
+        // 先发开关状态
+        ServerPlayNetworking.send(player, new com.github.zly2006.carpetslsaddition.net.BoardTogglePayload(enabled));
+        if (!enabled) {
+            return;
+        }
         ServerPlayNetworking.send(player, new BoardSyncPayload(BOARD_DEATHS, buildBoard(server, BOARD_DEATHS)));
         ServerPlayNetworking.send(player, new BoardSyncPayload(BOARD_MINED, buildBoard(server, BOARD_MINED)));
     }
@@ -77,4 +83,15 @@ public final class BoardSyncManager {
             syncTo(player);
         }
     }
+
+    private static volatile Boolean lastEnabled = null;
+
+    /** 由轮询线程每秒调用：规则值变化时同步给所有玩家。 */
+    public static void tick(MinecraftServer server) {
+        boolean now = com.github.zly2006.carpetslsaddition.SLSCarpetSettings.slsBoardEnabled;
+        if (lastEnabled == null || lastEnabled != now) {
+            lastEnabled = now;
+            syncToAll(server);
+        }
+    }
 }