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feat: forward plateindex for index-coded .gcode.3mf uploads Gcode inside a .gcode.3mf is index-coded (Metadata/plate_<N>.gcode) and a bundle may carry several, so the upload must name which plate to print — even a single-plate bundle, since its entry is still indexed. A 1-based plate index is stored in PrintHostUpload::extended_info when use_3mf is set; the OctoPrint and Moonraker hosts forward it as a `plateindex` form field. Servers that don't use it ignore the unknown field, so the plain G-code path is unchanged.