fix(auth-service): JWT access token 加入 type/userId/accountSequence 字段

presence-service 的 JwtAuthGuard 校验 payload.type === 'access'，
但之前 token 只有 sub/phone/source，导致心跳接口一直 401。

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

backend/services/auth-service/src/application/services/auth.service.ts

@@ -391,6 +391,9 @@ export class AuthService {
   private generateAccessToken(user: UserAggregate): string {
     const payload = {
       sub: user.accountSequence.value,
+      type: 'access',
+      userId: user.accountSequence.value,
+      accountSequence: user.accountSequence.value,
       phone: user.phone.value,
       source: user.source,
     };