fix(cli): store generated project settings with the project

[ItayTheDar]

Summary

Fixes #41. Generated apps now write settings.yaml to their own root instead of the installed PyNest package. CLI generation reads project-local settings from the current directory or an ancestor, so separate projects keep independent database/CLI choices.

The test dependency group now requests sqlalchemy[asyncio], fixing CI collection with SQLAlchemy 2.1 (which requires greenlet).

Verification

• CI-equivalent uv sync --no-dev --group test followed by pytest -q tests: 205 passed
• Separate CLI processes generated an async SQLite app and resource; imported the generated app and received HTTP 200 from GET /
• git diff --check: clean

The existing Black configuration has an invalid force-exclude regex, so its project-config check cannot run; checking with an empty config finds only pre-existing formatting in generate_service.py outside this diff.