docs: 初始化项目需求和协作文档

.gitignore

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+# IDE
+.idea/
+.vscode/
+
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+.Python
+
+# Virtual environments
+.venv/
+venv/
+env/
+
+# Django / local data
+*.sqlite3
+db.sqlite3
+data/uploads/
+data/chroma/
+media/
+staticfiles/
+
+# Environment variables
+.env
+.env.local
+
+# Test / coverage
+.pytest_cache/
+.coverage
+htmlcov/
+
+# OS
+.DS_Store
+Thumbs.db
+