Support OAuth HTTP Basic client auth

[RhysSullivan]

Summary

• persist the token endpoint client authentication method for manual OAuth apps
• let users choose request-body or HTTP Basic client authentication
• apply the saved method to code exchange, refresh, and client-credentials grants
• keep existing rows on request-body authentication

Companion X catalog fix: UsefulSoftwareCo/integrations#74

Verification

• TURBO_TEST_CONCURRENCY=4 bun run test
• bun run typecheck
• bun run lint
• bun run format:check
• cd e2e && bunx vitest run --project selfhost selfhost/oauth-app-modal.test.ts

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Cloudflare preview

Torn down — the PR is closed.

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✅ Deployment successful! View logs	executor-cloud	921b39e	Aug 31 2026, 08:45 AM

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commit: 921b39e