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- Add logout button to admin layout header (signOut from better-auth) - AUTH_DISABLED production guard already present in auth.ts middleware - Remove automatic email-based staff-user linking (security fix) - Add PATCH /api/staff/:id/link-user endpoint for manual linking by admins - Add rate limiting to Better Auth (10 req/min, database storage) Co-Authored-By: Paperclip <noreply@paperclip.ing>