* feat(ap): add support for shared inboxes to reduce outbound load
* feat(db): refactor ap followers db into followers repository
* fix(ap): use the updated activity library to pull out the shared inbox endpoint
* chore(deps): point at updated build of owncast/activity
* fix(ap): typeless endpoints
* feat(test): update ActivityPub test to support shared inboxes
* chore(test): remove unused variable
* fix: feedback from review. Guard against SSRF/non-HTTPS/local and handle transaction errors
* It builds with the new user repository
* fix(test): fix broken test
* fix(api): fix registration endpoint that was broken after the change
* fix(test): update test to reflect new user repository
* fix: use interface type instead of concrete type
* fix: restore commented out code
