feat: add daily learning summary script with cron task

- Create scripts/daily_learning.sh for daily chat review
- Set up cron task at 3 AM daily
- Log file: logs/daily_learning.log
- Learning records: memory/daily_learning.md

TOOLS.md

@@ -157,6 +157,14 @@ bash scripts/dingtalk_tts.sh "要说的内容"
 whisper /root/.openclaw/workspace-assistant/media/inbound/audio-xxx.ogg --language Chinese --model small
 ```
 
+## 语音处理规则
+
+**默认规则**：
+- 用户发语音 → Whisper 转文字 → **文字回复**
+- 用户特别标注「语音回复」→ MiniMax TTS → **语音回复**
+
+**简单说**：正常文字回复，特殊要求才语音回复
+
 ## ⚠️ 邮件操作安全规则
 
 **只读不删！** 严禁执行任何删除邮件的操作，包括但不限于：