feat: 添加JWT令牌刷新功能

- 新增 @nestjs/jwt 和 jsonwebtoken 依赖包
- 实现 refreshAccessToken 方法支持令牌续期
- 添加 RefreshTokenDto 和 RefreshTokenResponseDto
- 新增 /auth/refresh-token 接口
- 完善令牌刷新的限流和超时控制
- 增加相关单元测试覆盖
- 优化错误处理和日志记录

src/business/auth/auth.module.ts

@@ -6,6 +6,7 @@
  * - 用户登录、注册、密码管理
  * - GitHub OAuth集成
  * - 邮箱验证功能
+ * - JWT令牌管理和验证
  * 
  * @author kiro-ai
  * @version 1.0.0
@@ -13,22 +14,41 @@
  */
 
 import { Module } from '@nestjs/common';
+import { JwtModule } from '@nestjs/jwt';
+import { ConfigModule, ConfigService } from '@nestjs/config';
 import { LoginController } from './controllers/login.controller';
 import { LoginService } from './services/login.service';
 import { LoginCoreModule } from '../../core/login_core/login_core.module';
 import { ZulipCoreModule } from '../../core/zulip/zulip-core.module';
 import { ZulipAccountsModule } from '../../core/db/zulip_accounts/zulip_accounts.module';
+import { UsersModule } from '../../core/db/users/users.module';
 
 @Module({
   imports: [
     LoginCoreModule,
     ZulipCoreModule,
     ZulipAccountsModule.forRoot(),
+    UsersModule,
+    JwtModule.registerAsync({
+      imports: [ConfigModule],
+      useFactory: (configService: ConfigService) => {
+        const expiresIn = configService.get<string>('JWT_EXPIRES_IN', '7d');
+        return {
+          secret: configService.get<string>('JWT_SECRET'),
+          signOptions: {
+            expiresIn: expiresIn as any, // JWT库支持字符串格式如 '7d'
+            issuer: 'whale-town',
+            audience: 'whale-town-users',
+          },
+        };
+      },
+      inject: [ConfigService],
+    }),
   ],
   controllers: [LoginController],
   providers: [
     LoginService,
   ],
-  exports: [LoginService],
+  exports: [LoginService, JwtModule],
 })
 export class AuthModule {}