API endpoints for managing webhooks

[bluebubbles-copilot[bot]]

for automation

Issue Metadata

• User: @zach#3244
• Context: https://discord.com/channels/640229510662455326/1063197577400565810/1098059223524450334

[zacharyweiss]

Was there ever any progress on this, or other non-GUI ways to set the webhooks?

I'm attempting to set up the server completely declaratively with nix-darwin, and the webhooks seem to be the final hurdle