feat(housekeeping): unban-user packet

Incoming 9103 HousekeepingUnbanUserEvent — reads userId, resolves
the username via HabboManager.getHabboInfo(int) (covers both online
and offline paths in one call), then dispatches to
ModToolManager.unban(username) which clears all active rows from
the `bans` table for that user.

Reuses HousekeepingActionResultComposer with actionKey `user.unban`.
If the user never had an active ban the SQL UPDATE matches zero rows
and the handler responds with `ok: false, message: 'no_active_ban'`
— from a UI standpoint that's a no-op, not an error.

`mvn compile` clean.

Emulator/src/main/java/com/eu/habbo/messages/PacketManager.java

@@ -721,5 +721,6 @@ public class PacketManager {
         this.registerHandler(Incoming.HousekeepingFindUserByNameEvent, com.eu.habbo.messages.incoming.housekeeping.HousekeepingFindUserByNameEvent.class);
         this.registerHandler(Incoming.HousekeepingFindUserByIdEvent, com.eu.habbo.messages.incoming.housekeeping.HousekeepingFindUserByIdEvent.class);
         this.registerHandler(Incoming.HousekeepingBanUserEvent, com.eu.habbo.messages.incoming.housekeeping.HousekeepingBanUserEvent.class);
+        this.registerHandler(Incoming.HousekeepingUnbanUserEvent, com.eu.habbo.messages.incoming.housekeeping.HousekeepingUnbanUserEvent.class);
     }
 }

Emulator/src/main/java/com/eu/habbo/messages/incoming/Incoming.java

@@ -465,4 +465,5 @@ public class Incoming {
     public static final int HousekeepingFindUserByNameEvent = 9100;
     public static final int HousekeepingFindUserByIdEvent = 9101;
     public static final int HousekeepingBanUserEvent = 9102;
+    public static final int HousekeepingUnbanUserEvent = 9103;
 }

Emulator/src/main/java/com/eu/habbo/messages/incoming/housekeeping/HousekeepingUnbanUserEvent.java

@@ -0,0 +1,44 @@
+package com.eu.habbo.messages.incoming.housekeeping;
+
+import com.eu.habbo.Emulator;
+import com.eu.habbo.habbohotel.permissions.Permission;
+import com.eu.habbo.habbohotel.users.HabboInfo;
+import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.outgoing.housekeeping.HousekeepingActionResultComposer;
+
+public class HousekeepingUnbanUserEvent extends MessageHandler {
+    private static final String ACTION_KEY = "user.unban";
+
+    @Override
+    public int getRatelimit() {
+        return 1000;
+    }
+
+    @Override
+    public void handle() throws Exception {
+        if (!this.client.getHabbo().hasPermission(Permission.ACC_HOUSEKEEPING)) {
+            return;
+        }
+
+        int userId = this.packet.readInt();
+
+        if (userId <= 0) {
+            this.client.sendResponse(new HousekeepingActionResultComposer(ACTION_KEY, false, 0, "invalid_input"));
+            return;
+        }
+
+        HabboInfo info = Emulator.getGameEnvironment().getHabboManager().getHabboInfo(userId);
+
+        if (info == null) {
+            this.client.sendResponse(new HousekeepingActionResultComposer(ACTION_KEY, false, 0, "user_not_found"));
+            return;
+        }
+
+        // ModToolManager.unban only takes a username; the SQL UPDATE
+        // happens against active bans (ban_expire > now), so calling it
+        // on a never-banned user is a benign no-op that returns false.
+        boolean cleared = Emulator.getGameEnvironment().getModToolManager().unban(info.getUsername());
+
+        this.client.sendResponse(new HousekeepingActionResultComposer(ACTION_KEY, cleared, cleared ? userId : 0, cleared ? "" : "no_active_ban"));
+    }
+}