feat: 记忆体系统 v0.3.0 完成

## 核心功能
- 双记忆系统合并：picoclaw MEMORY.md + hxclaw 会话摘要
- 独立上下文系统：不依赖 picoclaw session
- 向量检索：硅基流动 BGE-M3 API
- 三重检测：关键词/向量相似度/命令

## 数据库
- libSQL (TursoDB) 存储
- sessions + chats 表设计
- 向量存储使用 binary 编码

## 查询场景
- RecallHistory: 查询所有会话摘要
- RecallTopic: 按话题向量检索
- RecallSession: 指定会话详情
- RecallWithinSession: 会话内检索

## 导出
- MongoDB 风格：~/.config/hxclaw/export-data.json
- chats 嵌套在 sessions 下
- 增量导出，同 session 累加

## UI 优化
- 合并状态显示（耗时 · 状态 · 消息数）
- 颜色设计：金色图标 + 暗绿色/暗红色状态

## 配置项
- memory.recall: keywords, auto_recall, similarity_threshold
- memory.vector: max_search_results
- memory.auto_export

go.sum

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@@ -76,6 +78,8 @@ github.com/clipperhouse/displaywidth v0.11.0 h1:lBc6kY44VFw+TDx4I8opi/EtL9m20WSE
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@@ -195,8 +199,8 @@ golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
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-golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
-golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
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@@ -243,8 +247,8 @@ modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
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