chore(pcb): initial kicad project

hardware/pcb/HeliosDAONE.kicad_sch

@@ -0,0 +1,20 @@
+(kicad_sch
+	(version 20250114)
+	(generator "eeschema")
+	(generator_version "9.0")
+	(uuid "ef4a6f87-87d3-400e-b11f-0c7519b83474")
+	(paper "A4")
+	(title_block
+		(title "Helios DA ONE")
+		(date "2026-02-18")
+		(rev "1.0.0")
+		(company "RayineElec")
+	)
+	(lib_symbols)
+	(sheet_instances
+		(path "/"
+			(page "1")
+		)
+	)
+	(embedded_fonts no)
+)