Send metadata for textures to get correct upload cost estimate.

[Rider-Linden]

When sending the request for a cost estimate for texture upload, include metadata about the texture size.

Issue: #5547

Description

During the price check phase of mesh upload, the simulator would send an array of empty textures (0 byte blobs).

In order to apply the correct upload cost, the simulator must be provided with at least the dimensions of the expected textures.

Related Issues

Issue: https://github.com/secondlife/server/issues/2392
Pull: https://github.com/secondlife/server/pull/2402

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Additional Notes

• 26.02 is the first viewer to allow 2K texture uploads as part of the mesh upload.
• The simulator requires a full "texture_list" array on the final upload.
• The simulator will still use the "texture_list" array for estimation if the "texture_info" is missing from the estimate request. In this case it assumes that the textures are 1K. The price check (expected != actual) will fail if the uploaded textures are larger and have not been scaled down by the viewer.

[Copilot]

Pull request overview

This PR updates the mesh upload fee estimation request so the simulator receives enough texture metadata (dimensions) to correctly estimate upload cost when full texture binaries are not included.

Changes:

• Add texture_info entries (width/height) during the fee-estimation path (include_textures == false) instead of sending only empty texture blobs.
• Preserve existing behavior for full uploads (include_textures == true) by still sending the complete texture_list.
• Minor indentation/formatting fix in wholeModelToLLSD().

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[akleshchev]

It's unlikely texture won't be loaded, but actual values in getFullWidth/getFullHeight might be inaccurate as texture wasn't yet converted to upload format from native format (mesh uploader just takes them as is, see LLImportMaterial), so it's better to convert to LLImageJ2C first.

And if getFullWidth() is 0, there likely is nothing to upload. If it haven't loaded by this point, likely never will, uploader would have waitied for it. Reporting a placeholder size would be counter productive.

[marchcat]

I'm trying to bring back my earlier attempt on better GLTF material uploading alongside the model.
This fix doesn't seem to interfere with that work.