feat: 付费体系重构 P0 - 配额独立化/简历付费下载/PDF生成

backend/src/modules/interview/interview.service.ts

@@ -5,6 +5,7 @@ import { Interview, InterviewDocument } from './interview.schema'
 import { Progress, ProgressDocument } from '../schemas/progress.schema'
 import { AiService } from '../ai/ai.service'
 import { UserService } from '../user/user.service'
+import { QuotaService } from '../user/quota.service'
 import { analyzeSpeech } from '../../common/utils/filler-words'
 
 @Injectable()
@@ -14,11 +15,11 @@ export class InterviewService {
     @InjectModel(Progress.name) private progressModel: Model<ProgressDocument>,
     private aiService: AiService,
     private userService: UserService,
+    private quotaService: QuotaService,
   ) {}
 
   async create(userId: string, position: string) {
-    // 扣减使用次数
-    await this.userService.deductRemaining(userId)
+    await this.quotaService.checkAndDeductInterview(userId)
 
     const firstQuestion = await this.aiService.call({
       systemPrompt: `你是一位专业的${position}面试官。请针对校招该岗位提出第一个面试问题，要求具体且有针对性。直接输出问题，不要多余内容。`,