refactor: switch to process.env for all packages, fix typos

cli/package.json

@@ -5,5 +5,8 @@
   "type": "module",
   "exports": {
     ".": "./dist/index.js"
+  },
+  "dependencies": {
+    "dotenv": "^17.4.2"
   }
 }

cli/src/index.ts

@@ -1 +1,6 @@
+import dotenv from "dotenv";
+
+// Load environment variables once at CLI application entry point
+dotenv.config();
+
 export {};