- Replace "SendinBlue" with "Brevo"
throughout the code.
- Maintain deprecated compatibility
versions on the old names/URLs.
(Split into separate commit
to make renamed files more
obvious.)
- Update docs to reflect change,
provide migration advice.
- Update integration workflow.
* Update docs to (usually) refer to Brevo rather than Sendinblue
* Change SENDINBLUE_API_URL to api.brevo.com
(same API is available on both domains)
* Leave code references (settings, backend name, webhook urls)
unchanged as `sendinblue`, to avoid unnecessary client changes