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/qingyan-research/generate_html.py

@@ -0,0 +1,33 @@
+import os
+import re
+import sys
+import argparse
+
+def safe_filename(title):
+    # 移除非法文件名字符
+    return re.sub(r'[\\/*?:"<>|]', "", title).strip()
+
+def main():
+    parser = argparse.ArgumentParser(description="Save HTML content to a local file.")
+    parser.add_argument("--title", required=True, help="Report title (used as filename)")
+    args = parser.parse_args()
+    
+    # 从标准输入 (STDIN) 读取所有内容，这不会受到 Shell 参数长度限制
+    try:
+        content = sys.stdin.read()
+        if not content:
+            print("Error: No content received from STDIN.", file=sys.stderr)
+            sys.exit(1)
+            
+        filename = f"{safe_filename(args.title)}.html"
+        
+        with open(filename, "w", encoding="utf-8") as f:
+            f.write(content)
+        
+        print(f"Successfully generated: {os.path.abspath(filename)}")
+    except Exception as e:
+        print(f"Error: {str(e)}", file=sys.stderr)
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()