Add vendor: Solo Satoshi

[SoloSatoshi]

What's in this PR

Type: New vendor listing

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About your shop

Shop name	Solo Satoshi
Website	https://solosatoshi.com
Region	North America
Where to find you in the community	https://x.com/SoloSatoshi, https://www.facebook.com/profile.php?id=61575323724787, https://www.youtube.com/@Solo.Satoshi, https://www.instagram.com/solosatoshi_/, https://www.reddit.com/r/SoloSatoshi/, https://primal.net/SoloSatoshi, https://linktr.ee/SoloSatoshi

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Vendor confirmation

I sell genuine Bitaxe hardware	Yes
My shop is live and active	Yes
I am reachable in the community	Yes
I use the correct name Bitaxe on my Bitaxe product pages	Yes
My Bitaxe product pages use real product photos	Yes
My Bitaxe product pages link to https://bitaxe.org	Yes
I do not sell Bitaxe-derived products in ways that violate Bitaxe open-source license terms	Yes
I am not aware of open fraud or counterfeit reports about my shop	Yes
I understand listings can be removed if confirmed issues arise	Yes

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Legit sellers matter. Support the devs. Support the project. The future of open-source mining depends on it.

[DerekLoadout]

Applied formal CI-only fixes in commit 85371bc:\n- fixed invalid JSON in vendors/solo-satoshi.json (description string newline)\n- renamed logo file to slug-based naming: logos/solo-satoshi.png\n\nNo qualitative/vendor-content review changes were made; leaving non-formal review to @skot and maintainers.