fix(platform): isolate game host leases

cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts

@@ -5,8 +5,9 @@ import type {
   GameServerMessage,
   PlatformToGameEvent,
 } from '../contracts/index.ts';
+import { Route } from '../../core/constants.ts';
 
-const RESERVED_ROUTES = new Set(['platform', 'agent', 'room']);
+const RESERVED_ROUTES = new Set<string>(Object.values(Route));
 const GAME_SESSION_OPEN_FAULT_BRAND = Symbol.for(
   'youle.framework.sdk.GameSessionOpenFault',
 );
@@ -81,10 +82,7 @@ export function isGameSessionOpenFault(value: unknown): value is GameSessionOpen
 export function assertGameEntry(entry: GameEntry): void {
   assertNonEmptyText(entry.key, 'key');
   assertGameId(entry.gameId);
-  assertNonEmptyText(entry.route, 'route');
-  if (RESERVED_ROUTES.has(entry.route)) {
-    throw new Error(`GameEntry reserved route: ${entry.route}`);
-  }
+  assertGameRoute(entry.route);
   if (typeof entry.resolveSeatCount !== 'function') {
     throw new Error('GameEntry resolveSeatCount must be a function');
   }
@@ -103,6 +101,14 @@ export function assertGameEntry(entry: GameEntry): void {
   }
 }
 
+/** The single GameEntry route admission check shared by runtime adapters. */
+export function assertGameRoute(route: unknown): asserts route is string {
+  assertNonEmptyText(route, 'route');
+  if (RESERVED_ROUTES.has(route)) {
+    throw new Error(`GameEntry reserved route: ${route}`);
+  }
+}
+
 /** Owns one isolated game module for one room at a time. */
 export class GameSessionHost {
   private module: GameModule | undefined;