[FIX] Auth/SOAP: Make SOAP authentication work again

[mjansenDatabay]

Triggered by the issue described in https://mantis.ilias.de/view.php?id=47821 , I had a closer look at the "SOAP Authentication" in ILIAS >= 10.x, which seemed broken because of fragile PHP code in the nusoap_client library.

• Refactored the SOAPAuth component structure to align with ILIAS 10 conventions: public demo endpoints are now exposed via public/auth/soap/example/..., classes are in src/, and namespaced under ILIAS\AuthSOAP.
• Introduced dedicated SOAP client classes (SessionValidationClient, SessionValidationResult, SoapAuthEndpoint) to encapsulate endpoint building, SOAP request execution, and typed result handling.
• Migrated SOAP-auth client calls from nusoap_client to native PHP SoapClient while preserving wire compatibility (RPC/encoded mode, .NET-specific parameter names/soapaction handling).
• Reworked dummy SOAP server behavior: native SoapServer handles POST SOAP calls; nusoap remains for WSDL/non-POST handling to keep compatibility.
• Fixed SOAP .NET configuration usage to consistently read soap_auth_use_dotnet (instead of mixed/incorrect key usage).
• Improved SOAP debug output presentation for Request/Response XML

If approved, this has to be picked/ported to release_11 and trunk.

[thojou]

Hey @mjansenDatabay,

Thanks for the PR! Aside from the minor docblock type suggestions, I noticed a naming inconsistency: the component directory is components/ILIAS/SOAPAuth, but its namespace is declared as ILIAS\AuthSOAP.

Could we align these to follow a consistent convention? Let me know what you think.

Kind Regrads,
@thojou

[mjansenDatabay]

• ILIAS\AuthSOAP

Hi @thojou ,

I decided to use ILIAS\AuthSOAP because the complete component was renamed to AuthSOAP with ILIAS 11.

Best regards,
Michael