feat: 新增/botall批量控制假人命令（sit/stand）

遍历所有isBot()为true的EntityPlayerMPFake，批量坐下/站起。重构SitCommand抽出sitPlayer公共方法。

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

@@ -2,6 +2,7 @@ package com.github.zly2006.carpetslsaddition;
 
 import carpet.CarpetExtension;
 import carpet.CarpetServer;
+import com.github.zly2006.carpetslsaddition.command.BotAllCommand;
 import com.github.zly2006.carpetslsaddition.command.BotCommand;
 import com.github.zly2006.carpetslsaddition.command.HatCommand;
 import com.github.zly2006.carpetslsaddition.command.SitCommand;
@@ -81,6 +82,7 @@ public class ServerMain implements ModInitializer, CarpetExtension {
             HatCommand.register(dispatcher);
             SitCommand.register(dispatcher);
             BotCommand.register(dispatcher);
+            BotAllCommand.register(dispatcher);
             LOGGER.info("[SLSA] commands registered: hat/sit/bot");
         } catch (Throwable t) {
             LOGGER.error("[SLSA] failed to register commands", t);