Validate Pybamm Model Config

Try to instantiate a pybamm/ionworks model with the given options.

Lightweight check that catches bad combinations of model name + options before a record is persisted. Builds the model in-process — same code path ModelService.get_pybamm_model_from_config uses at simulation time — and reports whether construction succeeded.

On failure the response carries the underlying exception's message verbatim (typically a pybamm OptionError / ValueError) so the caller can act on it.

The model is built and dropped; nothing is written to the database.