Verify workflow state version on staging deploy

[shuxueshuxue]

Summary

• tighten the staging deploy OpenAPI check so it must expose workflow state-version request fields
• catch stale backend deploys that still lack expected_state_version before we call staging healthy

Verification

• uv run python scripts/check_app_schema.py
• generated local FastAPI OpenAPI and ran the same jq contract check against it

Context

The current staging/prod deployment is on an older app commit and lacks the workflow state_version contract. This PR does not perform the deploy or schema migration; it makes the staging deploy workflow fail loudly if that contract is still absent after deployment.