[Lambiek12]

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• I opened an issue first for non-trivial changes and linked it below.
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Describe the problem

Currently OpenProvider.com is not available in the DNS Service list under Services → ACME Client → Challenge Types. This prevents automatic certificate issuance and renewal via DNS-01.

Adding OpenProvider.com (REST integration) as a supported DNS-01 validation provider in the os-acme-client plugin. The corresponding DNS API script (dns_openprovider_rest.sh) already exists in the acme.sh project and uses OPENPROVIDER_REST_USERNAME and OPENPROVIDER_REST_PASSWORD for authentication.

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Describe the proposed solution

PR adds support for OpenProvider.com DNS (REST integration):

• Adding dns_openprovider_rest to the DNS services list within AcmeClient.xml model
• Adding OPENPROVIDER_REST_USERNAME and OPENPROVIDER_REST_PASSWORD fields for Account authentication in dialogValidation.xml form
• Added new LeValidation class DnsOpenProvider.php in order to map new model fields to acme.sh environment

Allowing users to select the OpenProvider.com provider from the list and automate DNS-01 challenges.

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Related issue

#5788