Add Dart-side resolv.conf fallback using dart:io (#40)

The Kotlin writeResolv method channel silently fails in some cases.
Added direct Dart file creation as fallback in both splash_screen
and terminal_service (getProotShellConfig). Uses dart:io Directory
and File APIs to create config/resolv.conf directly, bypassing the
method channel entirely.

Co-Authored-By: Mithun Gowda B <mithungowda.b7411@gmail.com>

Author: mithun50

flutter_app/lib/screens/splash_screen.dart

@@ -1,3 +1,4 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
 import '../constants.dart';
@@ -51,6 +52,17 @@ class _SplashScreenState extends State<SplashScreen>
       try { await NativeBridge.setupDirs(); } catch (_) {}
       try { await NativeBridge.writeResolv(); } catch (_) {}
 
+      // Direct Dart fallback: create resolv.conf if native calls failed (#40).
+      try {
+        final filesDir = await NativeBridge.getFilesDir();
+        final configDir = '$filesDir/config';
+        final resolvFile = File('$configDir/resolv.conf');
+        if (!resolvFile.existsSync()) {
+          Directory(configDir).createSync(recursive: true);
+          resolvFile.writeAsStringSync('nameserver 8.8.8.8\nnameserver 8.8.4.4\n');
+        }
+      } catch (_) {}
+
       final prefs = PreferencesService();
       await prefs.init();
 

flutter_app/lib/services/terminal_service.dart

@@ -1,3 +1,4 @@
+import 'dart:io';
 import 'package:flutter/services.dart';
 import '../constants.dart';
 import 'native_bridge.dart';
@@ -33,6 +34,16 @@ class TerminalService {
     final prootPath = '$nativeLibDir/libproot.so';
     final libDir = '$filesDir/lib';
 
+    // Direct Dart fallback: create resolv.conf if it still doesn't exist
+    // after the native method channel calls (#40).
+    try {
+      final resolvFile = File('$configDir/resolv.conf');
+      if (!resolvFile.existsSync()) {
+        Directory(configDir).createSync(recursive: true);
+        resolvFile.writeAsStringSync('nameserver 8.8.8.8\nnameserver 8.8.4.4\n');
+      }
+    } catch (_) {}
+
     final storageGranted = await NativeBridge.hasStoragePermission();
 
     return {