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/resume-builder/references/keywords/general.txt

@@ -0,0 +1,25 @@
+SQL
+Excel
+PowerPoint
+Word
+Notion
+飞书
+Jira
+Asana
+英语
+项目管理
+跨部门协作
+推动落地
+ownership
+数据驱动
+用户同理心
+快速学习
+影响力
+说服力
+量化
+可迁移
+0-1
+1-N
+ROI
+KPI
+OKR