🔒 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/middleware/global/appAccessToken.middleware.ts

@@ -0,0 +1,12 @@
+import Elysia, { Context } from "elysia";
+import { returnErrorResponse } from "../../helpers/callback/httpResponse";
+
+export const appAccessTokenMiddleware = () =>
+  new Elysia().onRequest(({ request, set }) => {
+    const headerToken = request.headers.get("access_token");
+    const storedToken = process.env.API_KEY;
+
+    if (headerToken !== storedToken) {
+      return returnErrorResponse(set, 403, "Unauthorized");
+    }
+  });