feat: 初始化黄小瓜AI助手记忆仓库

- 核心配置: IDENTITY, USER, SOUL, AGENTS, TOOLS, HEARTBEAT, MEMORY
- memory/: 每日总结和临时记录
- skills/: 所有已安装技能
- notes/: 语音配置笔记

skills/xiucheng-self-improving-agent/skill.yaml

@@ -0,0 +1,10 @@
+name: self-improving-agent
+description: Self-improving agent system for continuous optimization
+version: "1.0.0"
+author: xiucheng
+type: skill
+tags:
+  - self-improvement
+  - learning
+  - optimization
+license: MIT