Add find-me LED locate on master and slaves via ESP-NOW.

UART FIND_ME (client_id 0 = local ring, >0 = unicast), ESPNOW_FIND_ME payload, CLI/dashboard buttons per slave.

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

main/powerpod.c

@@ -2,6 +2,7 @@
 #include "cmd_handler.h"
 #include "cmd_accel_deadzone.h"
 #include "cmd_espnow_unicast_test.h"
+#include "cmd_espnow_find_me.h"
 #include "cmd_client_info.h"
 #include "cmd_version.h"
 #include "cmd_ota.h"
@@ -169,6 +170,7 @@ void app_main(void) {
     cmd_client_info_register();
     cmd_accel_deadzone_register();
     cmd_espnow_unicast_test_register();
+    cmd_espnow_find_me_register();
     cmd_led_ring_register();
     cmd_ota_register();
     cmd_ota_slave_progress_register();