Add vendor: TheSoloMiningCo

[IamGPIO]

What's in this PR

Type: New vendor listing

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About your shop

Shop name	TheSoloMiningCo
Website	https://thesolomining.co
Region	Europe
Where to find you in the community	https://x.com/thesolominingco · https://instagram.com/thesolominingco · https://www.youtube.com/@TheSoloMiningCo

Note: in your vendor JSON social section, use only x, instagram, youtube, tiktok, nostr.

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Vendor confirmation

These confirmations are reviewed manually by maintainers and the community.

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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Anything else the community should know?

[DerekLoadout]

Thanks @IamGPIO — formal checks look good on my side (schema, slug/logo naming, validation passing), and PR formatting has been aligned.

No additional maintainer-side formal fixes are needed.
Leaving final qualitative/manual review to @skot.