domain/ ← pure Python only (no framework imports) │ application/ ← domain + port interfaces only │ infrastructure/ ← SQLModel, Alembic, SQLite adapters │ api/ ← FastAPI routers, middleware, dependency ...
GET /api/v1/sqlalchemy/items/{id} Bearer Get item (SQLAlchemy) PATCH /api/v1/sqlalchemy/items/{id} Bearer Update item (SQLAlchemy) DELETE /api/v1/sqlalchemy/items/{id ...