fix(ocm): include provider field in OCMProvider serialization

- Add `provider` to `jsonSerialize()` output of OCMProvider.
- Ensures discovery consumers receive provider identifier along with
  endpoint, version, and resources.

Signed-off-by: Micke Nordin <kano@sunet.se>

Author: mickenordin

lib/private/OCM/Model/OCMProvider.php

@@ -269,6 +269,7 @@ public function jsonSerialize(): array {
 			'version' => $this->getApiVersion(), // informative but real version
 			'endPoint' => $this->getEndPoint(),
 			'publicKey' => $this->getSignatory()?->jsonSerialize(),
+			'provider' => $this->getProvider(),
 			'resourceTypes' => $resourceTypes
 		];