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/run_quiz.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""生成出题 prompt。
+
+用法：python3 run_quiz.py <user_id> <document_id>
+
+根据已保存的知识点和用户掌握度记录，自动决定出题难度。
+- 从 mastery_records 读取每个知识点的 current_level
+- 首次出题的知识点强制 level=1
+- 输出 JSON 格式的 prompt（system_prompt + user_prompt），由 agent 发给 LLM 生成题目
+
+也支持指定知识点和难度：
+  python3 run_quiz.py <user_id> <document_id> [level] [kp_id1,kp_id2,...]
+"""
+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) < 3:
+        print("Usage: run_quiz.py <user_id> <document_id> [level] [kp_id1,kp_id2,...]")
+        print("  user_id:     User identifier")
+        print("  document_id: Document identifier")
+        print("  level:       Optional difficulty level (1/2/3)")
+        print("  kp_ids:      Optional comma-separated knowledge point IDs")
+        sys.exit(1)
+
+    user_id = sys.argv[1]
+    document_id = sys.argv[2]
+
+    level = None
+    kp_ids = None
+
+    if len(sys.argv) >= 4:
+        try:
+            level = int(sys.argv[3])
+        except ValueError:
+            # Maybe it's kp_ids instead
+            kp_ids = sys.argv[3].split(",")
+
+    if len(sys.argv) >= 5:
+        kp_ids = sys.argv[4].split(",")
+
+    service = QuizMasteryService(
+        base_dir=Path(__file__).resolve().parents[1] / "data"
+    )
+
+    result = service.generate_quiz_for_user(
+        user_id=user_id,
+        document_id=document_id,
+        knowledge_point_ids=kp_ids,
+        level=level,
+    )
+
+    print(json.dumps(result, ensure_ascii=False, indent=2))
+
+
+if __name__ == "__main__":
+    main()