Add automated fix workflow for AI nutritionist page

- Create .fixes/ directory structure for tracking repairs
- Add FIX-001 to FIX-009 repair tasks based on Cursor review
- Add automation scripts (start-fix.sh, complete-fix.sh)
- Update HEARTBEAT.md with repair checklist
- Create AUTOMATION_PLAN.md with workflow documentation

Fixes address:
- Remove fake initial data
- Add clear chat button
- Split oversized component
- Optimize multi-image upload
- Fix scroll behavior
- Remove dead code
- Extract hardcoded config

msh_single_uniapp/.fixes/backlog/FIX-009-h5-voice-fallback.md

@@ -0,0 +1,18 @@
+# FIX-009: H5 语音输入降级优化
+
+**状态**: 待开始  
+**创建时间**: 2026-02-28  
+**优先级**: 低  
+**负责人**: msh-agent  
+
+---
+
+## 问题描述
+
+H5 环境仅提示"暂不支持语音输入"，可考虑集成 Web Speech API 作为降级方案。
+
+---
+
+## 修复方案
+
+使用 Web Speech API (webkitSpeechRecognition) 作为 H5 环境的语音输入方案。