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- auth.ts: add google/github social providers from better-auth/social-providers - auth.ts: add getActiveProviders() to enumerate configured OAuth/social providers - index.ts: add /api/auth/providers public endpoint for frontend - App.tsx: update LoginPage to show Google/GitHub buttons based on /api/auth/providers response Co-Authored-By: Paperclip <noreply@paperclip.ing>