init: hgmj server initial commit

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

common/qrcode.go

@@ -0,0 +1,30 @@
+package common
+
+import (
+	"image"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
+
+	"github.com/makiuchi-d/gozxing"
+	"github.com/makiuchi-d/gozxing/qrcode"
+)
+
+func DecodeQRCode(file io.Reader) (content string, err error) {
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return
+	}
+	// prepare BinaryBitmap
+	bmp, err := gozxing.NewBinaryBitmapFromImage(img)
+	if err != nil {
+		return
+	}
+	// decode image
+	qrReader := qrcode.NewQRCodeReader()
+	result, err := qrReader.Decode(bmp, nil)
+	if err != nil {
+		return
+	}
+	return result.String(), nil
+}