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/iwd/iwd_dbus.c

@@ -0,0 +1,32 @@
+#include "iwd_dbus.h"
+#include <Eina.h>
+
+struct _Iwd_Dbus
+{
+   Eldbus_Connection      *conn;
+   Eldbus_Object          *root;
+   Eldbus_Proxy           *object_manager;
+   Eldbus_Signal_Handler  *name_owner_sh;
+};
+
+/* TODO:
+ *  - watch IWD_BUS_NAME owner (NameOwnerChanged) for restart handling
+ *  - call org.freedesktop.DBus.ObjectManager.GetManagedObjects on "/"
+ *  - listen for InterfacesAdded / InterfacesRemoved
+ *  - dispatch new objects to iwd_manager
+ */
+
+Iwd_Dbus *
+iwd_dbus_new(Eldbus_Connection *conn)
+{
+   Iwd_Dbus *d = calloc(1, sizeof(*d));
+   d->conn = conn;
+   return d;
+}
+
+void
+iwd_dbus_free(Iwd_Dbus *d)
+{
+   if (!d) return;
+   free(d);
+}