Adds acceptResidenceInvite / declineResidenceInvite to ResidenceApi
(POST /api/residences/{id}/invite/{accept|decline}) and exposes them via
APILayer. On accept success, myResidences is force-refreshed so the
newly-joined residence appears without a manual pull.
Wires NotificationActionReceiver's ACCEPT_INVITE / DECLINE_INVITE
handlers to the new APILayer calls, replacing the log-only TODOs left
behind by P4 Stream O. Notifications are now cleared only on API
success so a failed accept stays actionable.
Tests:
- ResidenceApiInviteTest covers correct HTTP method/path + error surfacing.
- NotificationActionReceiverTest invite cases updated to assert the new
APILayer calls (were previously asserting the log-only path).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>