feat: add Elysia adapter

[wobsoriano]

What kind of change does this PR introduce?

Feature

What is the current behavior?

No adapter exists for Elysia. Users building APIs with Elysia have to wire up Supabase auth manually using core primitives.

What is the new behavior?

Adds @supabase/server/adapters/elysia, a first-class plugin adapter for Elysia. Elysia has been gaining significant traction in the TypeScript ecosystem, particularly in the Bun community, for its end-to-end type safety and expressive plugin API.

Usage with a plain Elysia app:

import { Elysia } from 'elysia'
import { withSupabase } from '@supabase/server/adapters/elysia'

const app = new Elysia()
  .use(withSupabase({ allow: 'user' }))
  .get('/games', async ({ supabaseContext }) => {
    const { data: myGames } = await supabaseContext.supabase
      .from('favorite_games')
      .select()
    return myGames
  })

app.listen(3000)

Per-route auth using scoped groups:

const app = new Elysia()
  .get('/health', () => ({ status: 'ok' }))
  .group('/api', (app) =>
    app
      .use(withSupabase({ allow: 'user' }))
      .get('/profile', ({ supabaseContext }) => supabaseContext.userClaims),
  )

Custom error handling via Elysia's onError:

const app = new Elysia()
  .use(withSupabase({ allow: 'user' }))
  .onError(({ code, error, status }) => {
    if (code !== 'SupabaseAuthError') return
    const cause = error.cause as { code?: string; status?: number } | undefined
    return status((cause?.status as 401) ?? 500, {
      error: error.message,
      code: cause?.code,
    })
  })

Additional context

• Uses Elysia's .resolve() hook with .as('scoped') so the context propagates to parent app routes.
• Auth failures throw a SupabaseAuthError registered via .error(), Elysia's idiomatic custom error pattern. Consumers discriminate on code === 'SupabaseAuthError' in onError without needing to import the class.
• Test coverage mirrors the Hono and H3 adapter tests.
• README updated with Elysia examples, the Exports table, and the Runtimes section.

[pkg-pr-new]

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npm i https://pkg.pr.new/@supabase/server@46

commit: 2fbc72f