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GRO-153: /api/staff returned 403 for all staff because resolveStaffMiddleware looked up by staff.userId (Better-Auth ID) but dev login sent staff.id (PK), and existing staff records had userId=NULL. Changes: - resolveStaffMiddleware: try userId first, fall back to staff.id (dev mode) - resolveStaffMiddleware: try userId first, fall back to oidcSub (production) - GET /api/dev/users: include userId field for DevLoginSelector - DevLoginSelector: send userId (not staff.id) as X-Dev-User-Id - Migration 0018: backfill userId for known demo staff Co-Authored-By: Paperclip <noreply@paperclip.ing>