refactor(apps): remove AppManager dependency from deno-runtime Room class

room.ts previously imported `AppManager` from the server layer
(`@rocket.chat/apps-engine/server/AppManager.ts`) solely to type the
private [PrivateManager] symbol field that backs the deprecated
`usernames` getter. This created a cross-boundary import from the
Deno subprocess into the Node.js host.

Replace with a minimal inline `IRoomManager` interface that exposes only
the one method actually called:
  getBridges().getInternalBridge().doGetUsernamesOfRoomById()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: d-gubert

packages/apps/deno-runtime/lib/room.ts

@@ -1,7 +1,15 @@
 import type { IRoom } from '@rocket.chat/apps-engine/definition/rooms/IRoom.ts';
 import type { RoomType } from '@rocket.chat/apps-engine/definition/rooms/RoomType.ts';
 import type { IUser } from '@rocket.chat/apps-engine/definition/users/IUser.ts';
-import type { AppManager } from '@rocket.chat/apps-engine/server/AppManager.ts';
+
+/** Minimal interface covering the only AppManager capability used by Room */
+interface IRoomManager {
+	getBridges(): {
+		getInternalBridge(): {
+			doGetUsernamesOfRoomById(id: string | undefined): Promise<Array<string>>;
+		};
+	};
+}
 
 const PrivateManager = Symbol('RoomPrivateManager');
 
@@ -36,7 +44,7 @@ export class Room {
 
 	private _USERNAMES: Promise<Array<string>> | undefined;
 
-	private [PrivateManager]: AppManager | undefined;
+	private [PrivateManager]: IRoomManager | undefined;
 
 	/**
 	 * @deprecated
@@ -51,7 +59,7 @@ export class Room {
 
 	public set usernames(usernames) {}
 
-	public constructor(room: IRoom, manager: AppManager) {
+	public constructor(room: IRoom, manager: IRoomManager) {
 		Object.assign(this, room);
 
 		Object.defineProperty(this, PrivateManager, {