first drafts for inventory sync page

internal/site/response/body.go

@@ -42,6 +42,10 @@ func (b bodyRes) Redirect(code redirect.Code, to string) Response {
 	return Redirect(code, to).wrap(b)
 }
 
+func (b bodyRes) HTML(body []byte) Response {
+	return HTML(body).wrap(b)
+}
+
 func (b bodyRes) JSON(body any) Response {
 	return JSON(body).wrap(b)
 }
@@ -82,3 +86,11 @@ func (b bodyRes) getCookies() []http.Cookie {
 
 	return nil
 }
+
+func (b bodyRes) getContentType() (contentType string, ok bool) {
+	if b.res != nil {
+		return b.res.getContentType()
+	}
+
+	return "", false
+}