fix: e2e failures on the device: edit replies before their events, /ws closed on reboot

- runModelEdit sent an edit's events (room, roomRemoved, the orders,
  repeaters) before its reply, where PROTOCOL.md says they follow it. A
  client waiting for the reply read past them (test_adding_and_deleting_a_room).
- A restart dropped the /ws connections without a close, so clients never
  saw them go (test_reboot). ESPNetwork::end() now closes them too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ESPNetwork.cpp

@@ -57,6 +57,7 @@ void ESPNetwork::end() {
   SSDP.end();
   mqtt.end();
   sockEmit.end();
+  protoSocket.end();
   delay(100);
 }
 bool ESPNetwork::setup() {