supabase / auth / 22193936520

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github

feat: support custom oauth & oidc providers (#2357)

## Summary
Add configurable custom OAuth/OIDC providers (phase 1) so projects can
integrate self‑hosted/regional identity providers without requiring code
changes.

## Problem
Current OAuth/OIDC providers are hardcoded, require provider-specific
code and env vars, and block customers who need self‑hosted or custom
IdPs (e.g. GitHub Enterprise, LINE, internal OIDC servers).

## Solution
Introduce database‑backed `oauth_providers` with custom:{identifier}
IDs, OIDC discovery + OAuth2 manual configuration, admin CRUD APIs, and
tier‑gated quotas, reusing existing /authorize and /callback flows with
JWT state + PKCE.

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