Add toram boot entry and Install to RAM resume support

- grub.cfg: add "load to RAM (toram)" entry to advanced submenu
- install_to_ram.go: resume from existing /dev/shm/bee-live copy if
  source medium is unavailable after bee-web restart
- tasks.go: fix "Recovered after bee-web restart" shown on every run
  (check j.lines before first append, not after)
- bee-install: retry unsquashfs up to 5x with wait-for-remount on
  source loss; clear error message with bee-remount-medium hint
- bee-remount-medium: new script to find and remount live ISO source
  after USB/CD reconnect; supports --wait polling mode
- 9000-bee-setup: chmod +x for bee-install and bee-remount-medium

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/webui/tasks.go

@@ -613,8 +613,9 @@ func (q *taskQueue) runTask(t *Task, j *jobState, ctx context.Context) {
 	}
 	a := q.opts.App
 
+	recovered := len(j.lines) > 0
 	j.append(fmt.Sprintf("Starting %s...", t.Name))
-	if len(j.lines) > 0 {
+	if recovered {
 		j.append(fmt.Sprintf("Recovered after bee-web restart at %s", time.Now().UTC().Format(time.RFC3339)))
 	}