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-003-split-components.md

@@ -0,0 +1,32 @@
+# FIX-003: 拆分单文件组件
+
+**状态**: 待开始  
+**创建时间**: 2026-02-28  
+**优先级**: 高  
+**负责人**: msh-agent  
+
+---
+
+## 问题描述
+
+`ai-nutritionist.vue` 单文件超过 550 行，包含聊天、语音、图片、状态管理等多个功能模块，可维护性差。
+
+---
+
+## 修复方案
+
+拆分为以下组件：
+- `components/ai-chat/ChatMessage.vue` - 消息气泡
+- `components/ai-chat/ChatInput.vue` - 输入框
+- `components/ai-chat/VoiceRecorder.vue` - 语音录制
+- `components/ai-chat/ImageUploader.vue` - 图片上传
+
+---
+
+## 实施步骤
+
+- [ ] 1. 备份原文件
+- [ ] 2. 创建 `components/ai-chat/` 目录
+- [ ] 3. 逐个提取组件
+- [ ] 4. 在主文件引入组件
+- [ ] 5. 测试所有功能正常