feat(invoice): add send route

pkg/invoice/report/qrbill/html.go

@@ -0,0 +1,42 @@
+package qrbill
+
+import (
+	"bytes"
+	"html/template"
+
+	_ "embed"
+)
+
+//go:embed assets/ch-cross.svg
+var chCross template.HTML
+
+//go:embed assets/scissors.svg
+var scissors template.HTML
+
+//go:embed assets/template.html
+var htmlTemplate string
+
+//go:embed assets/style.css
+var style template.CSS
+
+type tmpler struct {
+	Invoice
+	Cross    template.HTML
+	Scissors template.HTML
+}
+
+func (i Invoice) CSS() template.CSS {
+	return style
+}
+
+func (i Invoice) HTML() (html template.HTML, err error) {
+	tmpl := template.Must(template.New("invoice").Parse(htmlTemplate))
+
+	data := tmpler{i, chCross, scissors}
+
+	buf := new(bytes.Buffer)
+	err = tmpl.Execute(buf, data)
+	html = template.HTML(buf.String())
+
+	return
+}