docs: refresh typebox protocol samples

docs/concepts/typebox.md

@@ -92,8 +92,8 @@ Connect (first message):
   "id": "c1",
   "method": "connect",
   "params": {
-    "minProtocol": 2,
-    "maxProtocol": 2,
+    "minProtocol": 3,
+    "maxProtocol": 3,
     "client": {
       "id": "openclaw-macos",
       "displayName": "macos",
@@ -115,7 +115,7 @@ Hello-ok response:
   "ok": true,
   "payload": {
     "type": "hello-ok",
-    "protocol": 2,
+    "protocol": 3,
     "server": { "version": "dev", "connId": "ws-1" },
     "features": { "methods": ["health"], "events": ["tick"] },
     "snapshot": {