feat: add REST API for categories, game creation, and guessing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/conftest.py

@@ -3,14 +3,30 @@ from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
 from models import Base
+from models.category import Category, CategoryWord  # noqa: F401
+from models.game import Game, Word  # noqa: F401
 
 
 @pytest.fixture
-def db_session():
+def db_engine():
     engine = create_engine("sqlite:///:memory:")
     Base.metadata.create_all(engine)
-    Session = sessionmaker(bind=engine)
+    yield engine
+    engine.dispose()
+
+
+@pytest.fixture
+def db_session(db_engine):
+    Session = sessionmaker(bind=db_engine)
     session = Session()
     yield session
     session.close()
-    engine.dispose()
+
+
+@pytest.fixture
+def app(db_engine):
+    from app import make_app
+
+    Session = sessionmaker(bind=db_engine)
+    application = make_app(session_factory=Session)
+    return application