添加.gitignore文件和项目依赖文件

创建.gitignore文件，忽略常见的操作系统和IDE文件
生成requirements.txt包含项目所有依赖

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

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+# macOS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# IDE
+.idea/
+.vscode/
+.claude/
+*.swp
+*.swo
+*~
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+pythonenv*
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# Logs
+logs/
+*.log

requirements.txt

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+# CardioAI - 心血管疾病智能辅助系统项目依赖
+# 请按以下步骤配置环境：
+# 1. 创建conda虚拟环境: conda create -n cardioenv python=3.10
+# 2. 激活环境: conda activate cardioenv
+# 3. 安装依赖: pip install -r requirements.txt
+
+pandas>=2.0.0
+openpyxl>=3.1.0
+numpy>=1.24.0
+scikit-learn>=1.3.0
+xgboost>=2.0.0
+joblib>=1.3.0
+streamlit>=1.28.0
+plotly>=5.18.0
+Flask>=3.0.0
+python-dotenv>=1.0.0
+langchain-openai>=0.0.5
+dashscope>=1.14.0
+requests>=2.31.0