Delete webhook

Update an existing webhook configuration. All fields except `_id` are optional; only provided fields will be updated. When provided, `name` must be 1-50 characters, `url` must be a valid URL, and `events` must contain at least one event. Whitespace is trimmed from `url` before validation. Webhooks are auto-disabled only once the endpoint has had no successful delivery for 3 days AND has either reached 20 consecutive terminal failures (each one an event that exhausted the full retry ladder) or been failing continuously for 3 days. The owner is emailed; re-enable it with `isActive: true`. A restricted (zrk_) API key can only set `events` to events whose resource group the key holds; an event outside the key's groups is rejected with 403. It also cannot widen an existing subscription past its own groups. `disabledResourceGroups` replaces the subscription's own denylist, which applies to delivery regardless of which key or session created it. Send an empty array to clear it. A restricted key's own disabled groups are unioned into the stored value on every update, so repointing a legacy unrestricted subscription with a restricted key also narrows it. Timing: the new denylist applies to every event emitted after the update. Events already queued for delivery when the update landed were filtered against the previous denylist and can still arrive at your endpoint for up to five minutes after they were enqueued, because the delivery worker trusts a five-minute enqueue-time snapshot before re-checking the subscription. Retries beyond that window, dead-letter replays, test fires, and redeliveries are all checked against the current denylist.