fix: extruder config parsing error

Author: Clon1998

common/lib/data/dto/config/config_extruder.dart

@@ -20,8 +20,8 @@ class ConfigExtruder with _$ConfigExtruder {
     required double maxTemp,
     required double maxPower,
     required double filamentDiameter,
-    required double maxExtrudeOnlyVelocity, // mm/s
-    required double maxExtrudeOnlyAccel, // mm/s^2
+    required double? maxExtrudeOnlyVelocity, // mm/s
+    required double? maxExtrudeOnlyAccel, // mm/s^2
   }) = _ConfigExtruder;
 
   factory ConfigExtruder.fromJson(String name, Map<String, dynamic> json) =>

lib/ui/components/dialog/filament_operation_dialog.dart

@@ -538,7 +538,7 @@ class _FilamentOperationDialogController extends _$FilamentOperationDialogContro
     state = AsyncValue.data(model.copyWith(movingFilament: true));
 
     final move = min(model.settings.nozzleExtruderDistance, model.extruderConfig.maxExtrudeOnlyDistance);
-    final veloc = min(model.settings.loadingSpeed, model.extruderConfig.maxExtrudeOnlyVelocity);
+    final veloc = min(model.settings.loadingSpeed, model.extruderConfig.maxExtrudeOnlyVelocity??50);
 
     if (args.isLoad) {
       await _printerService.moveExtruder(move, veloc, true);
@@ -554,7 +554,7 @@ class _FilamentOperationDialogController extends _$FilamentOperationDialogContro
     if (model == null) return;
     state = AsyncValue.data(model.copyWith(purgingFilament: true));
     final move = min(model.settings.purgeLength, model.extruderConfig.maxExtrudeOnlyDistance);
-    final veloc = min(model.settings.purgeSpeed, model.extruderConfig.maxExtrudeOnlyVelocity);
+    final veloc = min(model.settings.purgeSpeed, model.extruderConfig.maxExtrudeOnlyVelocity??50);
     await _printerService.moveExtruder(move, veloc, true);
 
     state = AsyncValue.data(state.requireValue.copyWith(purgingFilament: false));