STEP_050M07P34B_R01_VM103_CENTERING deploy exact canonical web source 9d8416cd2d8e P34B shared Admin workspace centering: constrain all Admin panels to centered shell, keep wide tables on local horizontal scroll, preserve accepted P34A Invited-by behavior and byte-identical Access, P34 backend/OpenAPI, Caddy/public ingress, library/SFTP, live provider/payment/SMTP semantics