Implemented admin pane + user permission

internal/storage/store.go

@@ -22,6 +22,8 @@ type InterfaceMeta struct {
 	ID      string `json:"id"`
 	Name    string `json:"name"`
 	Version int    `json:"version"`
+	// Kind is "plot" for split-layout plot panels, empty for free-form panels.
+	Kind string `json:"kind,omitempty"`
 }
 
 // VersionMeta describes a single persisted revision of an interface.
@@ -134,6 +136,7 @@ type rootAttrs struct {
 	Name    string   `xml:"name,attr"`
 	Version int      `xml:"version,attr"`
 	Tag     string   `xml:"tag,attr"`
+	Kind    string   `xml:"kind,attr"`
 }
 
 func (s *Store) readMeta(id string) (InterfaceMeta, error) {
@@ -145,7 +148,7 @@ func (s *Store) readMeta(id string) (InterfaceMeta, error) {
 	if err := xml.Unmarshal(data, &root); err != nil {
 		return InterfaceMeta{}, err
 	}
-	return InterfaceMeta{ID: id, Name: root.Name, Version: root.Version}, nil
+	return InterfaceMeta{ID: id, Name: root.Name, Version: root.Version, Kind: root.Kind}, nil
 }
 
 // Get returns the raw XML bytes for the interface with the given ID.