Restructure backend into modular API layers with admin/organizador/invitados routes, add role-based middleware, flatten module models, and update build scripts

packages/server/src/app.ts

@@ -0,0 +1,23 @@
+import express from "express";
+import { json } from "body-parser";
+import path from "path";
+import { registerApiRoutes } from "./api";
+
+export async function createApp() {
+  const app = express();
+
+  app.use(json());
+
+  registerApiRoutes(app);
+
+  // In production, serve the built admin UI
+  if (process.env.NODE_ENV === "production") {
+    const adminDist = path.join(__dirname, "../../admin/dist");
+    app.use(express.static(adminDist));
+    app.get("/*", (_req, res) => {
+      res.sendFile(path.join(adminDist, "index.html"));
+    });
+  }
+
+  return app;
+}