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/quiz-mastery/scripts/submit_answers.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+"""提交测验答案并评分。
+
+用法：python3 submit_answers.py <user_id> <document_id> <session_id> <answers_json>
+
+参数：
+  user_id:      用户标识
+  document_id:  文档标识
+  session_id:   测验会话 ID
+  answers_json: JSON 格式的答案字典，如 '{"q_001":"A","q_002":"True"}'
+
+输出：评分结果 JSON（score, total, accuracy, results）。
+"""
+from pathlib import Path
+import json
+import sys
+
+sys.path.append(str(Path(__file__).resolve().parents[1] / "src"))
+
+from quiz_mastery import QuizMasteryService
+
+
+def main() -> None:
+    if len(sys.argv) < 5:
+        print("Usage: submit_answers.py <user_id> <document_id> <session_id> <answers_json>")
+        sys.exit(1)
+
+    user_id = sys.argv[1]
+    document_id = sys.argv[2]
+    session_id = sys.argv[3]
+    answers = json.loads(sys.argv[4])
+
+    service = QuizMasteryService(
+        base_dir=Path(__file__).resolve().parents[1] / "data"
+    )
+
+    result = service.submit_quiz_answers(
+        user_id=user_id,
+        document_id=document_id,
+        session_id=session_id,
+        answers=answers,
+    )
+
+    print(json.dumps(result, ensure_ascii=False, indent=2))
+
+
+if __name__ == "__main__":
+    main()