## Summary
- enqueue `cloud_signup` conversion tracking after website attribution
is stored on a new cloud account
- keep authenticated add-workspace requests out of
attribution/conversion tracking
- reuse the existing marketing conversion tracking service and config
already available on `develop`
## Notes
- This PR only wires the signup path.
- Billing/plan activation conversion tracking is intentionally left out
for a separate rollout.
- The conversion service still no-ops outside Chatwoot Cloud and when
stored attribution has no supported click identifier.
