Sync lmstudio.js schema (2025-03-20)

[ncoghlan]

• Breaking change: gpuOffload -> gpu in model loading config
• gpuStrictVramCap is expected to be a temporary spelling

[ncoghlan]

This is needed as part of adding GBNF structured response schema support and support for client side preset config requests.

Draft for now pending further consideration of:

• gpuOffload -> gpu config field name change (the previous name wasn't final, but wasn't explicitly stated to be experimental at launch)
• gpuStrictVramCap (this isn't expected to be the final spelling of this field name)

[ncoghlan]

Interim approach to handling the configuration APIs is to exclude them from any backwards compatibility guarantees (they're unfortunately not stable enough yet to commit to maintaining their current form for all fields)