Relocate scripts/check_lambda_zip_size.py to
backend/app/requirements/, right beside the requirements.txt it's
built to measure, since it's specific to the fastapi lambda rather
than a generic repo script.
While moving it, also make the excludes list self-updating: the
script now reads zip_excludes straight out of
deployment/terraform/modules/lambda_with_api_gateway/variables.tf
by default instead of duplicating it as CLI flags, so the CI check
and the actual Terraform packaging can't drift apart. requirements.txt
defaults to the sibling file too, so both the CI step and local runs
now collapse to a bare `check_lambda_zip_size.py` invocation.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
