Fix daily limit parsing type error

lib/api/services/limit_service.dart

@@ -13,8 +13,8 @@ class Limit {
 
   factory Limit.fromJson(Map<String, dynamic> json) {
     return Limit(
-      dailyLimit: json['dailyLimit']!,
+      dailyLimit: (json['dailyLimit'] as num).toDouble(),
-      usedLimit: json['usedLimit']!,
+      usedLimit: (json['usedLimit'] as num).toDouble(),
     );
   }
 }