feat: implement obsidian-kb skill with long video chunking

- Multi-source content aggregation (Bilibili/YouTube/Zhihu)
- Smart inbox management with AI quality scoring
- Long video chunking analysis (30min+ auto-segmentation)
- Topic-based organization
- Git auto-sync to Obsidian
- Template system with Jinja2 and fallback rendering
- CLI commands: subscribe, inbox, process, skip, status, search
- Comprehensive test suite with unit and integration tests
- Documentation: README.md and SKILL.md

Checkpoint 7-8 completed by Agent E

skills/obsidian-kb/src/__init__.py

@@ -0,0 +1,36 @@
+"""Obsidian KB - 知识库内容管理技能
+Checkpoint 4-5: 内容处理管道与长视频分段分析
+"""
+
+from .models import Content, ContentType, ContentStatus, TimelineEntry, AnalysisResult
+from .light_scanner import LightScanner
+from .deep_analyzer import DeepAnalyzer
+from .pipeline import ProcessingPipeline
+from .content_chunker import ContentChunker, Chunk, get_chunking_strategy, chunk_content
+from .ai_client import AIClient
+from .config import Config, get_config
+
+__all__ = [
+    # 模型
+    'Content',
+    'ContentType',
+    'ContentStatus',
+    'TimelineEntry',
+    'AnalysisResult',
+    # 处理器
+    'LightScanner',
+    'DeepAnalyzer',
+    'ProcessingPipeline',
+    # 分片
+    'ContentChunker',
+    'Chunk',
+    'get_chunking_strategy',
+    'chunk_content',
+    # AI客户端
+    'AIClient',
+    # 配置
+    'Config',
+    'get_config',
+]
+
+__version__ = '0.2.0'