Manage dns records directly from whmcs admin dashboard

[YumeChaan]

This PR contains the same changes as #425.

A new PR targeting master was created because the previous PR included Composer-related changes (composer.json, composer.lock, autoload files, and vendor folder updates) that were introduced as part of the rest-client-php library upgrade on the old branch.

Since master is now up to date with the required rest-client-php version, this new PR includes only the ticket-related changes and excludes those dependency and vendor file updates.

Changes:

• Added new rest method getDnsDomainToken() in ApiHelper.
• Replaced legacy XML create token call with new REST based token flow.
• Refactored DNS helper to use REST API instead of deprecated XML API.
• Updated DNS controller to handle REST token redirect for Admin area.
• Updated client-side redirect logic to align with new REST Api flow.

[Copilot]

Pull request overview

This PR adds REST-based DNS domain-token generation and integrates a new “Manage DNS Zone” flow so WHMCS admins (and clients via existing hooks) can be redirected into Openprovider’s DNS management panel.

Changes:

• Added REST command mapping + ApiHelper::getDnsDomainToken() to generate DNS domain tokens via the REST client.
• Refactored DNS URL generation helper to use REST domain lookup + token creation (including Sectigo/Openprovider zone-provider selection).
• Added an Admin-area custom button + system route/controller action to redirect admins to DNS management.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
modules/registrars/openprovider/routes/system.php	Adds a new system route for the admin DNS management redirect action.
modules/registrars/openprovider/OpenProvider/API/CommandMapping.php	Maps createDomainTokenRequest to the REST DomainTokenApi::createToken endpoint.
modules/registrars/openprovider/OpenProvider/API/ApiHelper.php	Introduces getDnsDomainToken() wrapper around the new REST command.
modules/registrars/openprovider/openprovider.php	Exposes a new WHMCS admin custom button and handler function.
modules/registrars/openprovider/helpers/DNS.php	Refactors DNS redirect URL generation to use REST domain + token flow (non-static, DI-based).
modules/registrars/openprovider/Controllers/System/DnsController.php	Adds Admin-area redirect action for “Manage DNS Zone”.
modules/registrars/openprovider/Controllers/Hooks/DnsAuthController.php	Updates hook controller to use injected DNS helper (non-static).
modules/registrars/openprovider/Controllers/Hooks/ClientAreaPrimarySidebarController.php	Updates client-area sidebar controller to use injected DNS helper (non-static).

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