feat: add persisted wifi CLI settings for companion wifi builds

examples/companion_radio/NodePrefs.h

@@ -32,4 +32,7 @@ struct NodePrefs {  // persisted to file
   uint8_t client_repeat;
   uint8_t path_hash_mode;    // which path mode to use when sending
   uint8_t autoadd_max_hops;  // 0 = no limit, 1 = direct (0 hops), N = up to N-1 hops (max 64)
-};
+  uint8_t wifi_powersave;    // 0 = none, 1 = min, 2 = max
+  char wifi_ssid[33];
+  char wifi_pwd[65];
+};