refactor: migrate to ES modules

package.json type=module, tsconfig module/moduleResolution=NodeNext,
target es2022, explicit .js on all relative imports. Center: jsonwebtoken
& bcryptjs switched to default imports (ESM/CJS interop). Verified:
builds, boots, full auth + plugin round-trip work under ESM.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/realtime/realtime.gateway.ts

@@ -9,7 +9,7 @@ import {
 } from '@nestjs/websockets';
 import { Logger } from '@nestjs/common';
 import { Server, Socket } from 'socket.io';
-import { introspectGuildToken } from '../common/center-auth';
+import { introspectGuildToken } from '../common/center-auth.js';
 
 type XType = 'general' | 'work' | 'report' | 'discuss' | 'triage' | 'custom';
 
@@ -189,7 +189,7 @@ export class RealtimeGateway implements OnGatewayConnection, OnGatewayDisconnect
         wakeUserIds: ctx.wakeUserIds,
         mentionUserIds: ctx.mentionUserIds,
       });
-      s.emit('message.created', { ...data, wakeup });
+      s.emit('message.created', { ...data, channelId, wakeup });
     }
   }
 
@@ -204,7 +204,7 @@ export class RealtimeGateway implements OnGatewayConnection, OnGatewayDisconnect
     for (const s of sockets) {
       const recipientUserId = typeof s.data.userId === 'string' ? s.data.userId : `anon:${s.id}`;
       const wakeup = wakeupUserId !== null && recipientUserId === wakeupUserId;
-      s.emit('message.created', { ...data, wakeup });
+      s.emit('message.created', { ...data, channelId, wakeup });
     }
   }
 }