feat(communication): housekeeping ban-user + generic action-result

* HousekeepingBanUserComposer (OutgoingHeader 9102): (userId,
  reason, hours).

* HousekeepingActionResultEvent + Parser (IncomingHeader 9201):
  generic ack carrying (actionKey, ok, actionId, message). Same
  parser will back mute / kick / give-credits / room-close / etc.
  callers — adding a new HK action only needs a new outgoing
  composer plus the right ACTION_KEY constant on the server side.

vitest 138/138, `yarn compile:fast` clean.

packages/communication/src/messages/parser/housekeeping/HousekeepingActionResultParser.ts

@@ -0,0 +1,42 @@
+import { IMessageDataWrapper, IMessageParser } from '@nitrots/api';
+
+/**
+ * Generic ack for any housekeeping action (ban, mute, kick, give-credits,
+ * room-close, …). Carries an `actionKey` string so a single event handler
+ * can multiplex over many in-flight actions and resolve the right Promise
+ * via an `accept` predicate.
+ */
+export class HousekeepingActionResultParser implements IMessageParser
+{
+    private _actionKey: string = '';
+    private _ok: boolean = false;
+    private _actionId: number = 0;
+    private _message: string = '';
+
+    public flush(): boolean
+    {
+        this._actionKey = '';
+        this._ok = false;
+        this._actionId = 0;
+        this._message = '';
+
+        return true;
+    }
+
+    public parse(wrapper: IMessageDataWrapper): boolean
+    {
+        if(!wrapper) return false;
+
+        this._actionKey = wrapper.readString();
+        this._ok = wrapper.readBoolean();
+        this._actionId = wrapper.readInt();
+        this._message = wrapper.readString();
+
+        return true;
+    }
+
+    public get actionKey(): string { return this._actionKey; }
+    public get ok(): boolean { return this._ok; }
+    public get actionId(): number { return this._actionId; }
+    public get message(): string { return this._message; }
+}