fix: stabilize software updates

internal/web/server.go

@@ -1411,6 +1411,8 @@ func (s *Server) softwareUpdateStatusAPI(w http.ResponseWriter, r *http.Request,
 		"phase":           status.Phase,
 		"message":         status.Message,
 		"target_version":  status.TargetVersion,
+		"started_at":      status.StartedAt,
+		"updated_at":      status.UpdatedAt,
 		"current_version": state.CurrentVersion,
 		"latest_version":  state.LatestVersion,
 	})
@@ -1888,7 +1890,13 @@ func (s *Server) validSessionCSRF(r *http.Request, session *model.Session) bool
 
 func (s *Server) parseForm(w http.ResponseWriter, r *http.Request) error {
 	r.Body = http.MaxBytesReader(w, r.Body, 64<<10)
-	if err := r.ParseForm(); err != nil {
+	var err error
+	if strings.HasPrefix(strings.ToLower(r.Header.Get("Content-Type")), "multipart/form-data") {
+		err = r.ParseMultipartForm(64 << 10)
+	} else {
+		err = r.ParseForm()
+	}
+	if err != nil {
 		http.Error(w, "Ungültige Formulardaten", http.StatusBadRequest)
 		return err
 	}