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

zhiyin-app/src/pages/history/history.vue

@@ -54,6 +54,7 @@
       <text class="empty-title">{{ emptyTitle }}</text>
       <text class="empty-desc">{{ emptyDesc }}</text>
       <button class="empty-btn btn-gradient" @click="goInterview" v-if="filter === 'all'">开始第一次面试</button>
+      <button class="empty-btn" @click="goReviewRecording" style="margin-top:12rpx;background:#FFF;color:#4F46E5;border:2rpx solid #4F46E5;border-radius:var(--radius-round);padding:18rpx 48rpx;font-size:26rpx">🎙️ 录音复盘</button>
     </view>
   </view>
 </template>