prautoblogger_cloudflare_ai_token was missing from the $encrypted array
in sanitize_field(), so the token was stored as plaintext. On read,
decrypt() failed on the non-encrypted value and returned empty string,
causing HTTP 401 on every Cloudflare Workers AI call.
Fix: add the field to the encrypted list so future saves encrypt it.
Also add legacy plaintext detection in get_api_token() and the validator
so the existing DB value works immediately and gets auto-encrypted on
first use.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
49aee0b446