bump node version requirement

add conditional ENV setting

frontend/.nvmrc

-v18.12.1
\ No newline at end of file
+v18.13.0
\ No newline at end of file

package.json

@@ -5,6 +5,9 @@
   "main": "index.js",
   "author": "Timothy Carambat (Mintplex Labs)",
   "license": "MIT",
+  "engines": {
+    "node": ">=18"
+  },
   "scripts": {
     "lint": "cd server && yarn lint && cd .. && cd frontend && yarn lint",
     "setup": "cd server && yarn && cd .. && yarn setup:envs && echo \"Please run yarn dev:server and yarn dev:frontend in separate terminal tabs.\"",

server/endpoints/system.js

-require("dotenv").config({ path: `.env.${process.env.NODE_ENV}` });
+if (process.env.NODE_ENV === 'development') require("dotenv").config({ path: `.env.${process.env.NODE_ENV}` });
 const { viewLocalFiles } = require("../utils/files");
 const { getVectorDbClass } = require("../utils/helpers");
 

server/index.js

-require("dotenv").config({ path: `.env.${process.env.NODE_ENV}` });
+if (process.env.NODE_ENV === 'development') require("dotenv").config({ path: `.env.${process.env.NODE_ENV}` });
 const express = require("express");
 const bodyParser = require("body-parser");
 const cors = require("cors");