refactor: remove duplicate fixtures and add SQLite support

Task 2.5: Remove duplicate fixtures from integration tests
- test_auth_api.py, test_auth_services.py, test_models.py
- test_projects_api.py, test_seed.py, test_users_api.py
- Fix npytest typos in all test files

Task 3.2: Update SQLAlchemy configuration for SQLite
- Use generic Uuid type instead of PostgreSQL-specific UUID
- Use generic JSON type instead of PostgreSQL-specific JSONB
- Update database.py to handle SQLite connection args

Unit tests now run without PostgreSQL (5/8 passing)

apps/api/src/database.py

@@ -5,10 +5,18 @@ from src.config import Settings, build_database_url
 
 
 settings = Settings()
+database_url = settings.database_url
+
+# SQLite requires aiosqlite and different connect args
+connect_args = {}
+if database_url.startswith("sqlite"):
+    connect_args = {"check_same_thread": False}
+
 engine = create_async_engine(
-    settings.database_url,
+    database_url,
     future=True,
     poolclass=NullPool,
+    connect_args=connect_args,
 )
 SessionLocal = async_sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)