fix(idlewatcher): improve container readiness handling in wakeFromHTTP

- Updated the wakeFromHTTP method to send a 100 Continue response to prevent client wait-header timeout.
- Implemented logic for non-HTML requests to wait for the container to become ready, returning an error message if it times out, or redirecting if successful.
- Adjusted the waitForReady method to return true upon receiving a ready notification.

internal/idlewatcher/state.go

@@ -75,7 +75,7 @@ func (w *Watcher) waitForReady(ctx context.Context) bool {
 	// Wait for ready notification or context cancellation
 	select {
 	case <-w.readyNotifyCh:
-		return w.ready() // double-check in case of race condition
+		return true
 	case <-ctx.Done():
 		return false
 	}