Remove Item model from generated FastAPI project, add bare-minimum rule to AGENTS.md

[Copilot]

The generated FastAPI project includes a dead Item model in models.py with no routes or tests — pure boilerplate the user must delete.

• Remove Item model from fastapi/31-sqlalchemy.sh; models.py now only re-exports Base
• Update fastapi/example/example/models.py to match
• Add AGENTS.md with rule: generate a bare usable minimum, no placeholder models or unnecessary boilerplate

The alembic/env.py wildcard import (from models import *) continues to work with an empty module. The 35-example-model.sh test path is unaffected — it creates its own self-contained Example model.

Original prompt

class Item(Base):
tablename = "items"

i dont think this should be present in the generated fastap project. i need to delete that. this is extra work for user of generated project

add to AGENTS.md a rule, that we aim to generate a bare usable minimum.

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