Implemented admin pane + user permission

internal/controllogic/model.go

@@ -50,15 +50,25 @@ type Wire struct {
 	To       string `json:"to"`
 }
 
+// NodeGroup is a cosmetic, editor-side grouping of nodes. The engine ignores it;
+// it is stored and round-tripped so the editor keeps its visual organisation.
+type NodeGroup struct {
+	ID        string   `json:"id"`
+	Label     string   `json:"label,omitempty"`
+	Members   []string `json:"members"`
+	Collapsed bool     `json:"collapsed,omitempty"`
+}
+
 // Graph is a named, independently-enableable control-logic flow.
 type Graph struct {
-	ID      string `json:"id"`
-	Name    string `json:"name"`
-	Enabled bool   `json:"enabled"`
-	Version int    `json:"version,omitempty"` // git-style revision; bumped on each Save
-	Tag     string `json:"tag,omitempty"`     // optional revision label (e.g. "restored from v3")
-	Nodes   []Node `json:"nodes"`
-	Wires   []Wire `json:"wires"`
+	ID      string      `json:"id"`
+	Name    string      `json:"name"`
+	Enabled bool        `json:"enabled"`
+	Version int         `json:"version,omitempty"` // git-style revision; bumped on each Save
+	Tag     string      `json:"tag,omitempty"`     // optional revision label (e.g. "restored from v3")
+	Nodes   []Node      `json:"nodes"`
+	Wires   []Wire      `json:"wires"`
+	Groups  []NodeGroup `json:"groups,omitempty"`
 }
 
 func (n Node) param(key string) string {