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_list.c

@@ -0,0 +1,13 @@
+#include "wifi_list.h"
+
+/* TODO: Genlist of networks, sorted (known first, then signal desc),
+ *       with security icon, signal bars, and click → connect/auth flow. */
+
+Evas_Object *
+wifi_list_add(Evas_Object *parent)
+{
+   Evas_Object *gl = elm_genlist_add(parent);
+   return gl;
+}
+
+void wifi_list_refresh(Evas_Object *list EINA_UNUSED) { /* TODO */ }