Add vendor: Open Source Miners

[opensourceminers]

What's in this PR

Type: New vendor listing

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About your shop

Shop name	Open Source Miners
Website	https://opensourceminers.de
Region	Europe
Where to find you in the community	https://x.com/opensource_de

---

Vendor confirmation

Use Yes/No for each line. Keep the text and just replace the value.

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]

Formal checks look good from my side.

• Vendor JSON passes schema/slug validation.
• Logo filename and size are valid.
• PR title/body pass the metadata checks.
• Merge ref validates cleanly against current main.

Leaving trust/community review to maintainers/community.

[skot]

this looks good to me, thanks @opensourceminers

[opensourceminers]

Thank you a lot guys! A honor to be listed :)