🛠 refactor(_exe): complete event router

event_router.cpp

@@ -0,0 +1,10 @@
+#include "event_router.h"
+
+EventRouter *EventRouter::instance = nullptr;
+
+EventRouter* EventRouter::ins() {
+    if (! instance) {
+        instance = new EventRouter;
+    }
+    return instance;
+}