fix(userfront): prevent public env asset request

userfront/lib/main.dart

@@ -5,7 +5,6 @@ import 'dart:convert';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:easy_localization/easy_localization.dart' hide tr;
 import 'package:go_router/go_router.dart';
 import 'package:flutter_web_plugins/flutter_web_plugins.dart';
@@ -189,13 +188,6 @@ void main() async {
     return true;
   };
 
-  // .env가 없더라도 초기화 상태를 보장하도록 optional 로딩
-  try {
-    await dotenv.load(fileName: ".env", isOptional: true);
-  } catch (e) {
-    _log.warning("Warning: .env file load failed: $e");
-  }
-
   // 0. Initialize Logger
   LoggerService.init();