This PR renames all `SUPABASE_PUBLISHABLE_OR_ANON_KEY` env vars into
`SUPABASE_PUBLISHABLE_KEY` to make the new API keys default. This is in
coordination with the rest of the docs.
I've also cleaned up the `blocks/vue` package from unused files.
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## Summary by CodeRabbit
* **Breaking Changes**
* Public environment variable names renamed from PUBLISHABLE_OR_ANON_KEY
→ PUBLISHABLE_KEY across all framework integrations; update your
environment configs.
* **Documentation**
* All framework guides, .env examples and registry docs updated to use
the new variable names.
* **Chores**
* Cleaned up UI registry/templates: some example Vue registry items and
autogenerated registry artifacts were removed or simplified.
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Ivan Vasilov