feat(housekeeping): add find-user-by-name packet pair

First wire-level packet for the in-client housekeeping admin panel.
Adds an incoming handler (Incoming 9100) that resolves a username to
a HabboInfo (online via the HabboManager hashmap, offline via the
users-table SQL fallback) and replies with HousekeepingUserDetail
(Outgoing 9200) containing id / username / motto / look / rank / rank
name / online / lastOnline / credits / duckets / diamonds / email /
ipLogin / isBanned. Active-mute and active-trade-lock are written as
trailing booleans (currently false) so the renderer parser can pick
them up later behind a bytesAvailable guard once those manager APIs
are surfaced offline-side.

Permission gate is ACC_SUPPORTTOOL — same one ModTools already uses.
Avoids adding a new column to the permissions table on this slice; a
dedicated ACC_HOUSEKEEPING permission can be introduced later when
the destructive HK operations (give-credits, delete-room, reset-pwd)
go in.

Reserves the 9100..9199 / 9200..9299 ID blocks for the rest of the
HK packet surface (search-prefix, find-by-id, ban/mute/kick with
arbitrary duration, room actions, economy, catalog admin, dashboard
aggregate, audit log read).

`mvn compile` clean on Habbo 4.2.12.

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

@@ -716,5 +716,8 @@ public class PacketManager {
         this.registerHandler(Incoming.YouTubeRoomPlayEvent, com.eu.habbo.messages.incoming.rooms.youtube.YouTubeRoomPlayEvent.class);
         this.registerHandler(Incoming.YouTubeRoomWatchingEvent, com.eu.habbo.messages.incoming.rooms.youtube.YouTubeRoomWatchingEvent.class);
         this.registerHandler(Incoming.YouTubeRoomSettingsEvent, com.eu.habbo.messages.incoming.rooms.youtube.YouTubeRoomSettingsEvent.class);
+
+        // Housekeeping (in-client admin panel)
+        this.registerHandler(Incoming.HousekeepingFindUserByNameEvent, com.eu.habbo.messages.incoming.housekeeping.HousekeepingFindUserByNameEvent.class);
     }
 }

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

@@ -460,4 +460,7 @@ public class Incoming {
     public static final int YouTubeRoomPlayEvent = 8001;
     public static final int YouTubeRoomWatchingEvent = 8002;
     public static final int YouTubeRoomSettingsEvent = 8003;
+
+    // Housekeeping (in-client admin panel) — IDs 9100..9199 reserved
+    public static final int HousekeepingFindUserByNameEvent = 9100;
 }

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

@@ -0,0 +1,35 @@
+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.Habbo;
+import com.eu.habbo.habbohotel.users.HabboInfo;
+import com.eu.habbo.habbohotel.users.HabboManager;
+import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.outgoing.housekeeping.HousekeepingUserDetailComposer;
+
+public class HousekeepingFindUserByNameEvent extends MessageHandler {
+    @Override
+    public int getRatelimit() {
+        return 500;
+    }
+
+    @Override
+    public void handle() throws Exception {
+        if (!this.client.getHabbo().hasPermission(Permission.ACC_SUPPORTTOOL)) {
+            return;
+        }
+
+        String username = this.packet.readString();
+
+        if (username == null || username.isEmpty()) {
+            this.client.sendResponse(new HousekeepingUserDetailComposer(null));
+            return;
+        }
+
+        Habbo online = Emulator.getGameEnvironment().getHabboManager().getHabbo(username);
+        HabboInfo info = online != null ? online.getHabboInfo() : HabboManager.getOfflineHabboInfo(username);
+
+        this.client.sendResponse(new HousekeepingUserDetailComposer(info));
+    }
+}

Emulator/src/main/java/com/eu/habbo/messages/outgoing/Outgoing.java

@@ -586,4 +586,7 @@ public class Outgoing {
     public static final int YouTubeRoomWatchersComposer = 8002;
     public static final int YouTubeRoomSettingsComposer = 8003;
 
+    // Housekeeping (in-client admin panel) — IDs 9200..9299 reserved
+    public static final int HousekeepingUserDetailComposer = 9200;
+
 }

Emulator/src/main/java/com/eu/habbo/messages/outgoing/housekeeping/HousekeepingUserDetailComposer.java

@@ -0,0 +1,59 @@
+package com.eu.habbo.messages.outgoing.housekeeping;
+
+import com.eu.habbo.Emulator;
+import com.eu.habbo.habbohotel.modtool.ModToolBan;
+import com.eu.habbo.habbohotel.permissions.Rank;
+import com.eu.habbo.habbohotel.users.HabboInfo;
+import com.eu.habbo.messages.ServerMessage;
+import com.eu.habbo.messages.outgoing.MessageComposer;
+import com.eu.habbo.messages.outgoing.Outgoing;
+
+public class HousekeepingUserDetailComposer extends MessageComposer {
+    private static final int CURRENCY_DUCKETS = 0;
+    private static final int CURRENCY_DIAMONDS = 5;
+
+    private final HabboInfo info;
+
+    public HousekeepingUserDetailComposer(HabboInfo info) {
+        this.info = info;
+    }
+
+    @Override
+    protected ServerMessage composeInternal() {
+        this.response.init(Outgoing.HousekeepingUserDetailComposer);
+
+        if (this.info == null) {
+            this.response.appendBoolean(false);
+            return this.response;
+        }
+
+        Rank rank = this.info.getRank();
+        ModToolBan ban = Emulator.getGameEnvironment().getModToolManager().checkForBan(this.info.getId());
+
+        this.response.appendBoolean(true);
+        this.response.appendInt(this.info.getId());
+        this.response.appendString(safe(this.info.getUsername()));
+        this.response.appendString(safe(this.info.getMotto()));
+        this.response.appendString(safe(this.info.getLook()));
+        this.response.appendInt(rank != null ? rank.getId() : 0);
+        this.response.appendString(rank != null ? safe(rank.getName()) : "");
+        this.response.appendBoolean(this.info.isOnline());
+        this.response.appendInt(this.info.getLastOnline());
+        this.response.appendInt(this.info.getCredits());
+        this.response.appendInt(this.info.getCurrencyAmount(CURRENCY_DUCKETS));
+        this.response.appendInt(this.info.getCurrencyAmount(CURRENCY_DIAMONDS));
+        this.response.appendString(safe(this.info.getMail()));
+        this.response.appendString(safe(this.info.getIpLogin()));
+        this.response.appendBoolean(ban != null);
+        // Mute / trade-lock surface as future packet extensions; see the
+        // optional-trailing-field parser pattern on the renderer side.
+        this.response.appendBoolean(false);
+        this.response.appendBoolean(false);
+
+        return this.response;
+    }
+
+    private static String safe(String value) {
+        return value != null ? value : "";
+    }
+}