Support sealing mob skill

src/main/java/client/command/commands/gm2/MobSkillCommand.java

@@ -0,0 +1,32 @@
+package client.command.commands.gm2;
+
+import client.Character;
+import client.Client;
+import client.command.Command;
+import server.life.MobSkill;
+import server.life.MobSkillFactory;
+
+import java.util.Collections;
+
+public class MobSkillCommand extends Command {
+    {
+        setDescription("Apply a mob skill to all mobs on the map. Args: <mob skill id> <skill level>");
+    }
+
+    @Override
+    public void execute(Client client, String[] params) {
+        if (params.length < 2) {
+            throw new IllegalArgumentException("Mob skill command requires two args: mob skill id and level");
+        }
+
+        String skillId = params[0];
+        String skillLevel = params[1];
+        MobSkill mobSkill = MobSkillFactory.getMobSkill(Integer.parseInt(skillId), Integer.parseInt(skillLevel));
+        if (mobSkill == null) {
+            throw new IllegalArgumentException("Mob skill not found. Id: %s, level: %s".formatted(skillId, skillLevel));
+        }
+
+        Character chr = client.getPlayer();
+        chr.getMap().getAllMonsters().forEach(monster -> mobSkill.applyEffect(chr, monster, false, Collections.emptyList()));
+    }
+}