Closes the register-then-immediately-forgot race for good. Two parallel
calls to /velxio/api/send-welcome and /velxio/api/send-password-reset
were hitting Odoo's REPEATABLE-READ snapshot timing: both workers took
their snapshot BEFORE either had committed the partner row, so each
ran its own INSERT and the second blew up on the velxio_user_id
unique constraint — costing one of the two emails.
Add a new sync_partner() helper that POSTs to a new Odoo route
/velxio/api/upsert-partner (lives in velxio_subscription) which only
upserts the partner — no mail, no subscription, fast. Register and
forgot-password await this BEFORE firing the async welcome / reset
tasks. Each user's flow is sequential at the Velxio HTTP layer, so
the snapshot race disappears.
sync_partner() reuses the existing _post() error-swallowing pattern.
If Odoo is down, sync_partner returns None and the await is a no-op
— the user still registers / gets the generic 200, the welcome /
reset endpoints retain their defensive upsert as a fallback path.
4df7abc624