Fix Chrono 10 RSDA functor override and GUI static link ordering

[Copilot]

RsdaPtoFunctor was still using the pre-Chrono-10 ChLinkRSDA::TorqueFunctor::evaluate signature, so the override failed to compile once rsda_pto_functor.cpp was built. In the same build path, demo_vgoswec could also fail at link time because libseastack_app_lib.a was linked before the Chrono VSG / VSG / ImGui libraries it depends on.

• RSDA functor signature

  • Update RsdaPtoFunctor::evaluate in both declaration and definition to match Chrono 10:
    evaluate(time, rest_angle, angle, vel, link)
  • Keep the existing angle -> displacement, vel -> velocity, time -> time mapping into ComputeForce
  • Mark rest_angle unused and document that it is part of the Chrono 10 callback shape, not part of the PTO model inputs

• GUI/static-library link resolution

  • Reorder demo_vgoswec link inputs so SEAStack::app_lib appears before its Chrono VSG / VSG / ImGui dependencies
  • Collect GUI libraries into a single trailing group to satisfy left-to-right static link resolution
  • Accept both namespaced and non-namespaced vsgXchange / vsgImGui targets where exported that way

double evaluate(double time,
                double rest_angle,
                double angle,
                double vel,
                const ::chrono::ChLinkRSDA& link) override;