chore: initialize medical consultation agent demo

.gitignore

@@ -0,0 +1,44 @@
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.coverage
+htmlcov/
+.venv/
+venv/
+backend/.venv/
+
+# Node / frontend
+frontend/node_modules/
+frontend/dist/
+frontend/.npm-cache/
+frontend/*.tsbuildinfo
+
+# Local environment
+.env
+.env.*
+!.env.example
+
+# Local runtime data and generated artifacts
+storage/
+backend/storage/
+*.db
+*.sqlite
+*.sqlite3
+*.log
+*.pdf
+reports/
+uploads/
+
+# Demo-only or temporary files
+demo_frontend/
+backend/test*.sql
+
+# Editor / OS
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db