moved .env

math-tutor/.gitignore → .gitignore

 .venv/
 venv/
-.env
-.env-openai
-.env-ollama
-.env-gwdg
-.env-stochastik
+.env*
 __pycache__/
 *.pyc
 drawings/
 backend/app/storage/
 sources/
 logs/
+.agents
+.pnpm-store
+.pytest_cache/
\ No newline at end of file