feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/multi-search-engine/CHANNELLOG.md

@@ -0,0 +1,48 @@
+# Multi Search Engine
+
+## 基本信息
+
+- **名称**: multi-search-engine
+- **版本**: v2.0.1
+- **描述**: 集成17个搜索引擎（8国内+9国际），支持高级搜索语法
+- **发布时间**: 2026-02-06
+
+## 搜索引擎
+
+**国内（8个）**: 百度、必应、360、搜狗、微信、头条、集思录
+**国际（9个）**: Google、DuckDuckGo、Yahoo、Brave、Startpage、Ecosia、Qwant、WolframAlpha
+
+## 核心功能
+
+- 高级搜索操作符（site:, filetype:, intitle:等）
+- DuckDuckGo Bangs快捷命令
+- 时间筛选（小时/天/周/月/年）
+- 隐私保护搜索
+- WolframAlpha知识计算
+
+## 更新记录
+
+### v2.0.1 (2026-02-06)
+- 精简文档，优化发布
+
+### v2.0.0 (2026-02-06)
+- 新增9个国际搜索引擎
+- 强化深度搜索能力
+
+### v1.0.0 (2026-02-04)
+- 初始版本：8个国内搜索引擎
+
+## 使用示例
+
+```javascript
+// Google搜索
+web_fetch({"url": "https://www.google.com/search?q=python"})
+
+// 隐私搜索
+web_fetch({"url": "https://duckduckgo.com/html/?q=privacy"})
+
+// 站内搜索
+web_fetch({"url": "https://www.google.com/search?q=site:github.com+python"})
+```
+
+MIT License