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/models/base.py

@@ -1,8 +1,7 @@
 import uuid
 from datetime import datetime
 
-from sqlalchemy import DateTime, func
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy import DateTime, Uuid, func
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 
 
@@ -11,7 +10,7 @@ class Base(DeclarativeBase):
 
 
 class UUIDPrimaryKeyMixin:
-    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    id: Mapped[uuid.UUID] = mapped_column(Uuid(as_uuid=True), primary_key=True, default=uuid.uuid4)
 
 
 class TimestampMixin: