refactor: Git에서 데이터 제거, 설정·코드만 유지

파이프라인 산출물(data/, docs/)을 Git 추적에서 제외하고
히스토리를 단일 커밋으로 재구성해 저장소 용량을 경량화한다.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

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+# Local secrets and OS
+.env
+.DS_Store
+.idea
+
+# Runtime data & generated artifacts (scripts로 재생성)
+data/
+docs/
+logs/
+*.db
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff
+*.log
+local_settings.py
+
+# Flask stuff
+instance/
+.webassets-cache
+
+# Scrapy stuff
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# virtualenv
+.venv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+
+# Rope project settings
+.ropeproject