feat(registry): add @blobatar to the registry directory

[Alain00]

Adds @blobatar to the registry directory.

blobatar generates deterministic geometric avatars from any string — the same name always renders the same avatar, with no network request and no dependencies. The registry ships one item, avatar: a wrapper around shadcn's avatar that falls back to a generated blobatar when a user has no picture, so AvatarFallback stops being two initials on a grey circle.

• Registry: https://blobatar.dev/r/registry.json
• Item: https://blobatar.dev/r/avatar.json
• Source: https://github.com/Alain00/blobatar (MIT)

Requirements check:

• Open source and publicly accessible — MIT, source above.
• Valid against the registry schema, and served flat at the registry root (/r/registry.json, /r/avatar.json).
• No content property on files entries.
• pnpm validate:registries passes.

Installs cleanly today via the full URL (npx shadcn@latest add https://blobatar.dev/r/avatar.json); this entry is what makes @blobatar/avatar resolve by name.

[vercel]

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