automc: drop waker gate on backend-down predefined status

Previously, the predefined "asleep" MOTD response on backend-dial-failure
was only served when the route had a waker registered. For static fleets
(no auto-scale) the gate left clients with a silently-closed TCP socket on
status-pings whenever the backend was down — they couldn't tell whether
the route was wrong, the host was offline, or the proxy was down.

Drop the `waker != nil` gate so any known route's dial-failure on
NextState=Status falls back to the configured asleep/loading MOTD. The
existing per-route override + global AUTO_SCALE_ASLEEP_MOTD chain handles
the actual text. Login attempts still close silently as before — only
status pings get the fallback.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/connector.go

@@ -659,12 +659,18 @@ func (c *Connector) findAndConnectBackend(frontendConn net.Conn,
 			}
 		}
 
-		if waker != nil && nextState == mcproto.StateStatus {
+		if nextState == mcproto.StateStatus {
+			// Previously gated on `waker != nil` so only auto-scale routes
+			// got a predefined response. For static fleets (no waker) clients
+			// just saw a closed connection on backend-down. Now any known
+			// route whose backend dial fails returns the configured asleep/
+			// loading MOTD — falls back to the global AUTO_SCALE_ASLEEP_MOTD
+			// when no per-route override is set.
 			logrus.WithFields(logrus.Fields{
 				"client":   clientAddr,
 				"server":   serverAddress,
 				"isLegacy": isLegacy,
-			}).Debug("Scalable backend unreachable: serving predefined status response")
+			}).Debug("Backend unreachable: serving predefined status response")
 
 			br := bufio.NewReader(frontendConn)
 			if isLegacy {