Add dotenv to load .env file for Supabase config

- Add dotenv as dev dependency
- Load .env at top of config/environment.js
- Allows SUPABASE_URL and SUPABASE_ANON_KEY to be read from .env file

Author: chuckcarpenter

config/environment.js

@@ -1,5 +1,7 @@
 'use strict';
 
+require('dotenv').config();
+
 module.exports = function (environment) {
   const ENV = {
     modulePrefix: 'Swach',

package.json

@@ -144,6 +144,7 @@
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^9.2.1",
     "cross-env": "^10.1.0",
+    "dotenv": "^17.2.3",
     "electron": "^38.7.2",
     "ember-auto-import": "^2.12.0",
     "ember-cli": "^6.8.1",