feat: integrate bilibili-extractor into obsidian-kb

- Add extractors layer with BilibiliExtractor (Playwright stealth mode)
- Add outputs layer with ObsidianWriter and GitSync
- Implement subtitle/no-subtitle graceful degradation
- Update config with output and bilibili extraction settings
- Complete integration pipeline: extract → process → output → sync
- Add comprehensive tests (100% pass rate)
- Update documentation (SKILL.md, README.md, requirements.txt)

skills/obsidian-kb/src/models.py

@@ -89,15 +89,19 @@ class AnalysisResult:
     """AI深度分析结果"""
     main_topics: List[str] = field(default_factory=list)  # 主要主题
     key_insights: List[str] = field(default_factory=list)  # 关键洞察
-    timeline_summary: List[Dict[str, Any]] = field(default_factory=list)  # 时间线摘要
-    content_structure: str = ""  # 内容结构描述
+    action_items: List[str] = field(default_factory=list)  # 行动项
+    summary: str = ""  # 摘要
+    timeline: List[Dict[str, Any]] = field(default_factory=list)  # 时间线
     recommended_tags: List[str] = field(default_factory=list)  # 推荐标签
+    full_analysis: str = ""  # 完整分析
+    timeline_summary: List[Dict[str, Any]] = field(default_factory=list)  # 时间线摘要（兼容字段）
+    content_structure: str = ""  # 内容结构描述
     target_audience: str = ""  # 目标受众
     difficulty_level: str = "intermediate"  # 难度级别
-    
+
     def to_dict(self) -> Dict[str, Any]:
         return asdict(self)
-    
+
     @classmethod
     def from_dict(cls, data: Dict[str, Any]) -> "AnalysisResult":
         return cls(**data)