Changes to Generate one PWADTO

added the optional property detail/items/ctx to the response with the 422 status

added the optional property detail/items/input to the response with the 422 status

for the query request parameter model, default value was changed from gpt-3.5-turbo to gpt-5.6-luna

removed the enum value gpt-3.5-turbo from the query request parameter model

removed the enum value gpt-4 from the query request parameter model

removed the enum value gpt-4o-mini from the query request parameter model

added the new enum value gpt-5-nano to the query request parameter model

added the new enum value gpt-5.4-nano to the query request parameter model

added the new enum value gpt-5.6-luna to the query request parameter model