feat: WLAN-Treiber mit Onboarding-AP, Build-Credentials und Befehl net

src/net/nl_mdns.c

@@ -0,0 +1,5 @@
+#include "net/nl_mdns.h"
+
+/* Placeholder until the mDNS responder lands (plan 2, task 7). */
+void nl_mdns_on_ip_up(void) {}
+void nl_mdns_set_name(const char *name) { (void)name; }