Add LED ring control per client and broadcast over REST and WebSocket.

Solid color mode fills all ring LEDs; master routes UART commands to slaves
via ESPNOW_LED_RING. goTool exposes POST /api/led-ring, WebSocket set_led_ring,
and a dashboard LED panel with master/slave/all targets.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/cmd_led_ring.go

@@ -7,17 +7,12 @@ import (
 	"powerpod/gotool/pb"
 )
 
-const (
-	ledRingModeClear    = 0
-	ledRingModeProgress = 1
-	ledRingModeDigit    = 2
-	ledRingModeBlink    = 3
-	ledRingModeFindMe   = 4
-)
-
 func runLedRing(sp *serialPort, args []string) error {
 	fs := flag.NewFlagSet("led-ring", flag.ExitOnError)
-	mode := fs.String("mode", "progress", "clear, progress, digit, blink, or find-me")
+	mode := fs.String("mode", "progress", "clear, color, progress, digit, blink, or find-me")
+	clientID := fs.Uint("client", 0, "0=master ring, >0=slave via ESP-NOW")
+	allClients := fs.Bool("all", false, "broadcast to all slaves")
+	slavesOnly := fs.Bool("slaves-only", false, "with -all: do not change master ring")
 	progress := fs.Uint("progress", 0, "fill level 0–100 (mode=progress)")
 	digit := fs.Uint("digit", 0, "digit 0–10 (mode=digit)")
 	r := fs.Uint("r", 0, "red 0–255")
@@ -30,20 +25,9 @@ func runLedRing(sp *serialPort, args []string) error {
 		return err
 	}
 
-	var modeVal uint32
-	switch *mode {
-	case "clear":
-		modeVal = ledRingModeClear
-	case "progress":
-		modeVal = ledRingModeProgress
-	case "digit":
-		modeVal = ledRingModeDigit
-	case "blink":
-		modeVal = ledRingModeBlink
-	case "find-me", "find_me", "findme":
-		modeVal = ledRingModeFindMe
-	default:
-		return fmt.Errorf("unknown -mode %q (clear, progress, digit, blink, find-me)", *mode)
+	modeVal, err := ledRingModeFromString(*mode)
+	if err != nil {
+		return err
 	}
 
 	resp, err := sp.ledRingProgress(&pb.LedRingProgressRequest{
@@ -56,11 +40,15 @@ func runLedRing(sp *serialPort, args []string) error {
 		Intensity:  uint32(*intensity),
 		BlinkMs:    uint32(*blinkMs),
 		BlinkCount: uint32(*blinkCount),
+		ClientId:   uint32(*clientID),
+		AllClients: *allClients,
+		SlavesOnly: *slavesOnly,
 	})
 	if err != nil {
 		return err
 	}
-	fmt.Printf("success=%v mode=%d progress=%d digit=%d\n",
-		resp.GetSuccess(), resp.GetMode(), resp.GetProgress(), resp.GetDigit())
+	fmt.Printf("success=%v mode=%d progress=%d digit=%d client_id=%d slaves_updated=%d\n",
+		resp.GetSuccess(), resp.GetMode(), resp.GetProgress(), resp.GetDigit(),
+		resp.GetClientId(), resp.GetSlavesUpdated())
 	return nil
 }