chore: initial project setup with backend, frontend, and infrastructure

Add complete NexaPantry application structure including:
- Docker Compose configuration with PostgreSQL, Redis, FastAPI backend, worker, frontend and Caddy
- Environment configuration template with database, auth, and service settings
- GitHub Actions CI workflow for backend/frontend linting, testing, auditing and Docker builds
- AGPL-3.0 license and comprehensive README with setup, development, and security documentation
- Backend

.gitignore

@@ -0,0 +1,14 @@
+.env
+.venv/
+node_modules/
+dist/
+__pycache__/
+.pytest_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+*.pyc
+postgres_data/
+redis_data/
+*.log
+