Initial commit: backend scaffold, auth, frontend login

- FastAPI + SQLAlchemy async + Alembic + Postgres backend
- Auth: JWT access + rotating refresh tokens, argon2, roles, audit log
- React 19 + Vite frontend: login page, protected route, auth context
- Docker Compose: postgres, redis, migrate, api, worker (placeholder), frontend/nginx

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,36 @@
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+venv/
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+htmlcov/
+.coverage
+coverage.xml
+
+# Env & secrets
+.env
+.env.local
+*.pem
+*.key
+
+# Node
+node_modules/
+dist/
+.vite/
+
+# Data & artifacts
+/data/
+/storage/
+*.sqlite3
+*.db
+
+# IDE / OS
+.idea/
+.vscode/
+.DS_Store
+Thumbs.db
+settings.local.json*