modularize code, add dummy version of roverd

server/public/loader.js

@@ -0,0 +1,22 @@
+(function () {
+  const modules = {};
+  const cache = {};
+
+  window.registerModule = function (name, factory) {
+    modules[name] = factory;
+  };
+
+  window.requireModule = function (name) {
+    if (cache[name]) {
+      return cache[name];
+    }
+    const factory = modules[name];
+    if (!factory) {
+      throw new Error(`Module ${name} not found`);
+    }
+    const exports = {};
+    cache[name] = exports;
+    factory(requireModule, exports);
+    return exports;
+  };
+})();