refactor, add cad

cad/Schematics/splitflap-backplane/gbr/splitflap-backplane-PTH.drl

@@ -0,0 +1,157 @@
+M48
+; DRILL file {KiCad 9.0.4-9.0.4-0~ubuntu22.04.1} date 2025-10-10T14:12:52+0200
+; FORMAT={-:-/ absolute / inch / decimal}
+; #@! TF.CreationDate,2025-10-10T14:12:52+02:00
+; #@! TF.GenerationSoftware,Kicad,Pcbnew,9.0.4-9.0.4-0~ubuntu22.04.1
+; #@! TF.FileFunction,Plated,1,2,PTH
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