fix: improve file filtering, add new utility,

- Improved the speed of file filtering in `crawl_local_files.py` with folder-level exclusion
- Added `fix_yaml.py` utility for YAML indentation fixes
- Updated `nodes.py` to support up to 20 core abstractions
- add option for no cache.

.gitignore

@@ -99,4 +99,11 @@ coverage/
 llm_cache.json
 
 # Output files
-output/
+output/
+
+# uv manage
+pyproject.toml
+uv.lock
+
+docs/*.pdf
+docs/design-cn.md