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

backend/pyproject.toml

@@ -0,0 +1,43 @@
+[project]
+name = "nexapantry-backend"
+version = "0.1.0"
+description = "Self-hosted pantry management backend"
+requires-python = ">=3.12"
+dependencies = [
+  "fastapi>=0.115.0",
+  "uvicorn[standard]>=0.30.0",
+  "sqlalchemy>=2.0.30",
+  "psycopg[binary]>=3.2.0",
+  "pydantic-settings>=2.4.0",
+  "python-jose[cryptography]>=3.3.0",
+  "passlib[argon2]>=1.7.4",
+  "python-multipart>=0.0.9",
+  "cryptography>=42.0.0",
+  "httpx>=0.27.0",
+  "email-validator>=2.2.0",
+  "redis>=5.0.0",
+  "tenacity>=8.5.0"
+]
+
+[project.optional-dependencies]
+dev = [
+  "pytest>=8.2.0",
+  "pytest-cov>=5.0.0",
+  "ruff>=0.5.0",
+  "mypy>=1.10.0",
+  "bandit>=1.7.9",
+  "pip-audit>=2.7.0",
+  "types-python-jose>=3.3.4",
+  "types-passlib>=1.7.7"
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "UP", "B", "S"]
+ignore = ["B008", "E501", "S101", "S105"]
+
+[tool.pytest.ini_options]
+testpaths = ["app/tests"]