removed country flags package and read flags from server and implement svg cahce structure

lib/core/config/app_config.dart

@@ -33,6 +33,10 @@ class AppConfig {
     // }
   }
 
+  static String get flagUrl {
+    return 'https://app.opplens.com/api/v1/flags/';
+  }
+
   // کلیدهای حساس را به این شکل مدیریت کنید
   static String get apiKey {
     if (isDevelopment) {

lib/core/services/cache_init.dart

@@ -0,0 +1,7 @@
+import 'svg_cache.dart';
+
+class CacheInit {
+  static Future<void> init() async {
+    await SvgCache().init();
+  }
+}

lib/core/services/svg_cache.dart

@@ -0,0 +1,78 @@
+import 'dart:io';
+
+import 'package:dio/dio.dart';
+import 'package:flutter/foundation.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SvgCache {
+  static final SvgCache _instance = SvgCache._internal();
+  factory SvgCache() => _instance;
+  SvgCache._internal();
+
+  final Dio _dio = Dio();
+  Directory? _cacheDir;
+
+  Future<void> init() async {
+    if (kIsWeb) {
+      // Web doesn't need directory initialization
+      return;
+    }
+
+    final appDir = await getApplicationDocumentsDirectory();
+    _cacheDir = Directory('${appDir.path}/svg_cache');
+    if (!await _cacheDir!.exists()) {
+      await _cacheDir!.create(recursive: true);
+    }
+  }
+
+  Future<String?> getCachedPath(String url) async {
+    if (kIsWeb) {
+      return await _getWebCachedPath(url);
+    }
+
+    final fileName = _getFileName(url);
+    final file = File('${_cacheDir!.path}/$fileName');
+    return await file.exists() ? file.path : null;
+  }
+
+  Future<String> cacheSvg(String url) async {
+    if (kIsWeb) {
+      return await _cacheWebSvg(url);
+    }
+
+    final fileName = _getFileName(url);
+    final file = File('${_cacheDir!.path}/$fileName');
+    final response = await _dio.get(
+      url,
+      options: Options(responseType: ResponseType.plain),
+    );
+    await file.writeAsString(response.data);
+    return file.path;
+  }
+
+  Future<String?> _getWebCachedPath(String url) async {
+    final prefs = await SharedPreferences.getInstance();
+    final fileName = _getFileName(url);
+    return prefs.containsKey('svg_cache_$fileName')
+        ? 'web_cache_$fileName'
+        : null;
+  }
+
+  Future<String> _cacheWebSvg(String url) async {
+    final response = await _dio.get(
+      url,
+      options: Options(responseType: ResponseType.plain),
+    );
+    final fileName = _getFileName(url);
+    final prefs = await SharedPreferences.getInstance();
+
+    // Store SVG data in SharedPreferences for web
+    await prefs.setString('svg_cache_$fileName', response.data);
+    return 'web_cache_$fileName';
+  }
+
+  String _getFileName(String url) {
+    return url.split('/').last.replaceAll(RegExp(r'[^a-zA-Z0-9._-]'), '_');
+  }
+}