feat: implement CRUD APIs for projects and scenarios with validated schemas

dependencies.py

@@ -0,0 +1,12 @@
+from __future__ import annotations
+
+from collections.abc import Generator
+
+from services.unit_of_work import UnitOfWork
+
+
+def get_unit_of_work() -> Generator[UnitOfWork, None, None]:
+    """FastAPI dependency yielding a unit-of-work instance."""
+
+    with UnitOfWork() as uow:
+        yield uow