Require 2FA before deleting services

[techulus-agent]

Summary

• Require server-side password + TOTP verification before service deletion when the current user has 2FA enabled.
• Keep the existing service delete flow unchanged for users without 2FA.
• Add conditional password/authenticator-code fields to the service delete dialog and keep the dialog open on verification errors.
• Add focused helpers/tests for service-delete confirmation and 2FA code normalization.

Validation

• ./node_modules/.bin/biome check --write on touched files
• ./node_modules/.bin/vitest run tests/two-factor.test.ts tests/service-delete-confirmation.test.ts
• ./node_modules/.bin/tsc --noEmit --pretty false

Note: the local toolchain still prints non-fatal mise warnings while trying to refresh pnpm metadata, but the checks completed successfully.

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit a38ac10.}