feat(env): conditionally load .env file for Node.js 20.6+; remove dotenv dependency

src/main.ts

@@ -1,4 +1,7 @@
-import "dotenv/config";
+// Cargar .env localmente solo si Node soporta process.loadEnvFile (Node.js 20.6+)
+if (typeof (process as any).loadEnvFile === 'function') {
+    (process as any).loadEnvFile();
+}
 
 import Amayo from "./core/client";
 import { loadCommands } from "./core/loaders/loader";