Added basic export and import feature

src/HopFrame.Core/Services/ITableManager.cs

@@ -10,6 +10,7 @@ public interface ITableManager {
     public Task DeleteItem(object item);
     public Task EditItem(object item);
     public Task AddItem(object item);
+    public Task AddAll(IEnumerable<object> items);
     public Task RevertChanges(object item);
     
     public Task<string> DisplayProperty(object? item, PropertyConfig prop, object? value = null, object? enumerableValue = null);

src/HopFrame.Core/Services/Implementations/TableManager.cs

@@ -49,6 +49,12 @@ internal sealed class TableManager<TModel>(DbContext context, TableConfig config
         await context.SaveChangesAsync();
     }
 
+    public async Task AddAll(IEnumerable<object> items) {
+        var table = context.Set<TModel>();
+        await table.AddRangeAsync(items.Cast<TModel>());
+        await context.SaveChangesAsync();
+    }
+
     public async Task RevertChanges(object item) {
         var entry = context.Entry((TModel)item);
         await entry.ReloadAsync();