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/e_mod_config.c

@@ -0,0 +1,26 @@
+#include "e_mod_main.h"
+#include "e_mod_config.h"
+
+E_Iwd_Config *e_iwd_config = NULL;
+
+void
+e_iwd_config_load(void)
+{
+   /* TODO: register E_Config_DD and load saved config */
+   e_iwd_config = E_NEW(E_Iwd_Config, 1);
+   e_iwd_config->auto_connect = 1;
+   e_iwd_config->show_hidden = 0;
+   e_iwd_config->refresh_interval = 5;
+}
+
+void
+e_iwd_config_save(void)
+{
+   /* TODO: e_config_domain_save */
+}
+
+void
+e_iwd_config_dialog_show(void)
+{
+   /* TODO: build E_Config_Dialog */
+}