* feat(typesafe): support Jev 1.14 images, box questions, and long-context headers
* fix(cost): drop the typesafe/jev-1.14.0 entry main already prices
* fix(typesafe): send images only with the images header and box questions only to models that answer them
TypeSafe takes assets and input_image parts only when the request carries
TypeSafe-Danger-Zone-Images: true, so without it they follow drop_params like
any other provider that cannot take images. Box support now comes from a
supports_box_questions cost-map flag set on jev-1.14.0 and jev-preview, so
jev-1.13.0 and jev-latest refuse or drop a box question before the call. A
malformed provider_specific_header answers 400 instead of 500.
* fix(typesafe): allow null box confidence and validate asset references and base64
* fix(typesafe): gate box questions on the images header, drop unreadable assets under drop_params, forward opt-in headers on the pass-through
---------
Backport of #46596 to rc/1.106.0
Cherry-picked from 3fec5075fa (main)
Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
