feat(events): make card, ACL and board events webhook-compatible

[cbcoutinho]

Summary

Implements OCP\EventDispatcher\IWebhookCompatibleEvent on Deck's event base classes so the webhook_listeners app (added in NC 30) can serialize and deliver them. Today Deck dispatches plain OCP\EventDispatcher\Event instances, so the listener has nothing to serialize and Deck cannot drive any webhook automation.

This is the path the maintainer suggested in #3341 (use flow_webhooks rather than building a webhook system inside Deck). With this change in place, an admin can register listeners for OCA\Deck\Event\CardCreatedEvent, CardUpdatedEvent, CardDeletedEvent, BoardUpdatedEvent, and the ACL events directly through the existing webhook UI.

Changes

File	Change
lib/Event/ACardEvent.php	implements IWebhookCompatibleEvent — getWebhookSerializable() returns ['card' => $card->jsonSerialize()] (covers CardCreatedEvent, CardUpdatedEvent, CardDeletedEvent)
lib/Event/AAclEvent.php	implements IWebhookCompatibleEvent — getWebhookSerializable() returns ['acl' => $acl->jsonSerialize()]. The existing Acl::jsonSerialize() already strips token, so it is not exposed via webhooks
lib/Event/BoardUpdatedEvent.php	implements IWebhookCompatibleEvent — returns ['boardId' => $boardId] (the event only carries the id today; receivers can fetch detail via API if needed)
tests/unit/Event/WebhookCompatibleEventsTest.php	New unit tests asserting interface conformance and payload shape for CardCreatedEvent, AclCreatedEvent, and BoardUpdatedEvent

The shape ({"<entity>": …}) follows the convention used by core OCP events such as OCP\Files\Events\Node\AbstractNodeEvent and OCP\SystemTag\TagAssignedEvent.

Compatibility

appinfo/info.xml requires nextcloud min-version="34". IWebhookCompatibleEvent was introduced in NC 30, so no version gate is needed.

Refs

• Closes (or contributes to) Flow integration #1722 — Flow integration
• Closes (or contributes to) Feature request: Automated Deck card actions and webhook-compatible event #7299 — Feature request: Automated Deck card actions and webhook-compatible event
• Follows the maintainer guidance in Webhook support/notification system #3341

Test plan

• CI passes (composer test:unit)
• Register a webhook against a homelab NC for OCA\Deck\Event\CardCreatedEvent and confirm the receiver gets {"event": {"card": {…}}, …}
• Repeat for CardUpdatedEvent, CardDeletedEvent, BoardUpdatedEvent, AclCreatedEvent
• Confirm token field is absent from the ACL payload

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