🔒 add app access token middleware

Create a middleware app access token, so that all requests must include `access_token` in the header with a value equal
to API_KEY in the .env file. If not, a `403 Forbidden` error will be returned.

src/index.ts

@@ -1,10 +1,14 @@
+import { appAccessTokenMiddleware } from "./middleware/global/appAccessToken.middleware";
 import { validateEnv } from "./utils/startups/validateEnv";
 validateEnv();
 
 const { Elysia } = await import("elysia");
 const { routes } = await import("./routes");
 
-const app = new Elysia().use(routes).listen(process.env.APP_PORT || 3000);
+const app = new Elysia()
+  .use(appAccessTokenMiddleware())
+  .use(routes)
+  .listen(process.env.APP_PORT || 3000);
 
 console.log(
   `🦊 Elysia is running at ${app.server?.hostname}:${app.server?.port}`