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GRO-162: Groomer role was blocked from GET /api/staff with 403 because the /staff/* route guard required "manager" role for all HTTP methods. Changed the guard to only require "manager" for write operations (POST/PUT/PATCH/DELETE), matching the pattern used for /clients and /appointments where all roles can read but only managers (or managers + receptionists) can write. Co-Authored-By: Paperclip <noreply@paperclip.ing>