- Remove the 'written to the database — not your environment file' aside from the Instance step intro
- Render a read-only, disabled DB-name field under App URL, populated from GET /api/setup/status dbName
- Helper text explains DB is configured via Docker env; only dbName is surfaced (T-12-3DB)
- Tests: assert aside absent, DB field readOnly/disabled with mocked dbName, existing DB validation row intact