fix(oauth): use client_secret_id instead of provider id for encrypted secret lookup

The getIdentityProvider query was using ip.id to retrieve the encrypted
OAuth client secret, but secrets are stored under ip.client_secret_id.
This caused PROVIDER_NOT_CONFIGURED errors when the IDs didn't match.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: theothersideofgod

graphql/server/src/middleware/oauth.ts

@@ -132,7 +132,7 @@ async function getIdentityProvider(
       ip.display_name,
       ip.enabled,
       ip.client_id,
-      "${encryptedSecretsSchema}".get(ip.id, 'oauth_client_secret') as client_secret,
+      "${encryptedSecretsSchema}".get(ip.client_secret_id, 'oauth_client_secret') as client_secret,
       ip.authorization_url,
       ip.token_url,
       ip.userinfo_url,