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/watcher.go

@@ -332,6 +332,7 @@ func NewWatcher(parent task.Parent, r types.Route, cfg *types.IdlewatcherConfig)
 
 			w.idleTicker.Stop()
 			w.healthTicker.Stop()
+			w.setReady()
 			close(w.readyNotifyCh)
 			w.task.Finish(cause)
 		}()