feat: interview review module with whisper.cpp ASR + AI analysis + frontend page

New backend module 'interview-review' provides:
- Audio upload (50MB limit, MP3/M4A/WAV/AAC/OGG/MP4/WebM)
- Text transcript submission
- whisper.cpp local ASR integration (tiny + base models)
- AI analysis (4-dimension scoring: logic/expression/professionalism/stability)
- Speech analysis (filler words detection, pace, duration)
- Async processing pipeline with status polling
- Graceful fallback to mock ASR when whisper unavailable

New frontend page 'pages/review/review.vue' with 3 modes:
- List mode: review history with status indicators
- Upload mode: audio file upload or text paste
- Report mode: score radar, dimension bars, analysis details

Docs updated: PROJECT-STATUS.md v4.4, FEATURE-LIST.md v4.2, ROADMAP.md v4.2

backend/src/app.module.ts

@@ -26,6 +26,7 @@ import { ScheduleModule } from './modules/schedule/schedule.module'
 import { TtsModule } from './modules/tts/tts.module'
 import { PricingModule } from './modules/schemas/pricing.module'
 import { ShareModule } from './modules/share/share.module'
+import { InterviewReviewModule } from './modules/interview-review/interview-review.module'
 
 const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://localhost:27017/zhiyin'
 
@@ -60,6 +61,7 @@ const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://localhost:27017/zhiyin
     TtsModule,
     PricingModule,
     ShareModule,
+    InterviewReviewModule,
   ],
   providers: [
     JwtStrategy,