fix(kb-workflow): 修正路径管理和子技能逻辑

- kb_workflow.py: 修复目录查询命令(--pending, --metadata等)
- bilibili_metadata.py: headless默认True，逻辑保持纯净
- deep_analyzer.py: 添加缺失的pathlib.Path导入
- SKILL.md: 更新步骤说明，明确由workflow提供路径给子技能

fix: 修复Playwright启动失败(NameError)和路径自动获取问题

skills/kb-deep-analyzer/deep_analyzer.py

@@ -16,6 +16,7 @@ import os
 import sys
 import re
 from datetime import datetime
+from pathlib import Path
 from typing import Dict, Any, List, Optional, Tuple
 from dataclasses import dataclass, field, asdict