test(orm): move + convert model query tests to sqlite base TestCase

Relocate tests/masoniteorm/models/test_model_query.py to
tests/masoniteorm/sqlite/models/test_sqlite_model_query.py and convert
it from self-contained pytest fixtures to the shared sqlite TestCase.

- Seed a third user (Alice) on top of the shared seeder's Joe/Jane and
  rewrite all 44 assertions against that 3-user dataset.
- Narrow now-Optional first()/find() results with `assert ... is not None`.
- Route exists tests through User.query().where(...).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: tmgbedu

fastapi_startkit/tests/masoniteorm/fixtures/factory.py

@@ -1,4 +1,4 @@
-from fastapi_startkit.orm.factory.factory import Factory
+from fastapi_startkit.masoniteorm import Factory
 from .model import User