Phase 0: scaffold e_iwd Enlightenment module

Meson build, module entry points, and stub layout for the iwd backend
(D-Bus client, gadget, popup, config, UI widgets). Bodies are TODOs;
this compiles against EFL/E headers but performs no D-Bus work yet.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ui/wifi_status.c

@@ -0,0 +1,12 @@
+#include "wifi_status.h"
+
+/* TODO: current connection summary widget (SSID, signal, IP, Disconnect). */
+
+Evas_Object *
+wifi_status_add(Evas_Object *parent)
+{
+   Evas_Object *box = elm_box_add(parent);
+   return box;
+}
+
+void wifi_status_refresh(Evas_Object *o EINA_UNUSED) { /* TODO */ }