Shipping database changes with SSDT and DACPAC

AppHubDb ships as an SSDT database project. Build emits a DACPAC you can publish to SQL Server or Azure SQL for repeatable environments.

Checklist

1. Build the .sqlproj in Release.
2. Run post-deploy for idempotent demo data.
3. Run smoke tests on a fresh database.

Keep schema in SSDT; avoid competing EF migrations unless you intentionally change ownership.