Remove the one-time env-to-config migration from the settings

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -82,8 +82,7 @@ docker compose -f docker-compose.release.yml logs codecraft   # one-time setup c
 Open `http://localhost:8787`, enter the setup code and create the admin account. Then add a
 provider under *Settings → Providers & models*. `.env` only holds deployment settings; keys,
 tokens and everything else are set in the UI and stored in the configuration file
-(`${NAME}` references to environment variables still work, and *Settings → Config file* moves
-their values into the file).
+(`${NAME}` references to environment variables still work).
 
 **Update:** `docker compose -f docker-compose.release.yml pull && docker compose -f docker-compose.release.yml up -d`.
 Releases are named `vYYYYMM-NNNNN` (a counter per month). Pin one with