Add example model step to FastAPI test setup

[Copilot]

Adds a new fastapi/35-example-model.sh step that creates a real SQLAlchemy model with async CRUD routes tested against PostgreSQL, demonstrating that the scaffolded app can easily be extended with new models.

• fastapi/35-example-model.sh — Creates an Example SQLAlchemy ORM model, async CRUD routes using Depends(get_db), a conftest.py with async DB fixtures (create_all/drop_all against real PostgreSQL), and async tests using httpx.AsyncClient
• fastapi/test.sh — Sources the new step after everything.sh, before flake8/pytest run
• .github/workflows/test.yaml — Passes DATABASE_URL env var for FastAPI tests to connect to the PostgreSQL service
• NOT included in fastapi/everything.sh — exists solely for test validation of app extensibility
• test_create_example POSTs via API, then verifies the row exists in PostgreSQL via select
• test_list_examples inserts a row directly into the DB, then verifies it appears in the GET API response
• All 4 tests pass against real PostgreSQL, flake8 clean

Original prompt

in fastapi etup create one extra step "example model" or something. do not include it in everything, but include it in tests setup. intention is to use it to tst that our app can easly be extendend with models and tested with that

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[SupraSummus]

@copilot

[SupraSummus]

setup in this test should be replaced by directly creatng instance in db

[Copilot]

Replaced the POST setup with direct db insertion: _examples_db[999] = ExampleItem(id=999, name="lookup test"), then GET /examples/999. (13c846f)

[SupraSummus]

in this test there should be assert that instnace exists in the db

[Copilot]

Added assert data["id"] in _examples_db to verify the created instance exists in the db after POST. (13c846f)

[SupraSummus]

what? i want real postgres test, not some in-memory faking. please see how this is done in django scripts. @copilot

[Copilot]

Rewrote the entire step to use real PostgreSQL with SQLAlchemy. The example model is now a proper Example(Base) ORM model with async CRUD routes using Depends(get_db). The conftest creates/drops tables in a real PostgreSQL database, and tests verify data directly via select queries. Also updated the CI workflow to pass DATABASE_URL for the FastAPI tests. (a1e8532)