Remove Authenticator model and add drop-table migration

[initstring]

Motivation

• Passkey/authenticator support was removed from the application but the Authenticator model and its relation remained in the Prisma schema and DB, causing confusion and potential upgrade issues.

Description

• Removed the Authenticator model and the User.authenticators relation from prisma/schema.prisma to reflect the app's current auth model.
• Added a migration SQL file prisma/migrations/20250207090000_remove_authenticator/migration.sql that drops the legacy Authenticator table from the database.
• Kept the change focused to schema + migration only to preserve downstream Prisma shapes and avoid altering unrelated models.

Testing

• Ran a code search with rg "Authenticator" -n to locate schema and migration uses (succeeded and confirmed references prior to removal).
• Attempted npm run db:migrate -- --name remove-authenticator --create-only which failed in this environment due to DATABASE_URL not being set (expected in CI/local with proper env).
• Attempted npx prisma migrate diff --from-migrations prisma/migrations --to-schema-datamodel prisma/schema.prisma --script which failed because a --shadow-database-url is required for diffs against a migrations directory (expected without a shadow DB).
• A manual migration file was created to ensure database upgrades will drop the Authenticator table when applied in a properly configured environment.

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Codex Task

[initstring]

@codex review.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Nice work!

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