refactor: Convert AGVPathResult.Path from List<string> to List<MapNode>

## Summary
- Changed Path property type from List<string> to List<MapNode> for better type safety
- Eliminated O(n) node lookups throughout pathfinding system
- Added DirectionalHelper with motor direction consistency bonus/penalty
- Updated all path processing to work with MapNode objects directly

## Files Modified
- AGVPathResult.cs: Path property and CreateSuccess() method signature
- AStarPathfinder.cs: Path generation and node lookup optimization
- AGVPathfinder.cs: Path processing with MapNode objects
- DirectionChangePlanner.cs: Direction change planning with MapNode paths
- DockingValidator.cs: Docking validation with direct node access
- UnifiedAGVCanvas.Events.cs: Path visualization with MapNode iteration
- UnifiedAGVCanvas.cs: Destination node access
- VirtualAGV.cs: Path conversion to string IDs for storage
- DirectionalHelper.cs: Enhanced with motor direction awareness
- NodeMotorInfo.cs: Updated for new path structure

## Benefits
- Performance: Eliminated O(n) lookup searches
- Type Safety: Compile-time checking for node properties
- Code Quality: Direct property access instead of repeated lookups
- Maintainability: Single source of truth for node data

## Build Status
✅ AGVNavigationCore: Build successful (0 errors, 2 warnings)

🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

Cs_HMI/AGVLogic/AGVSimulator/Forms/SimulatorForm.cs

@@ -300,13 +300,19 @@ namespace AGVSimulator.Forms
 
             // 현재 AGV 방향 가져오기
             var selectedAGV = _agvListCombo.SelectedItem as VirtualAGV;
-            var currentDirection = selectedAGV?.CurrentDirection ?? AgvDirection.Forward;
+            if(selectedAGV == null)
+            {
+                MessageBox.Show("Virtual AGV 가 없습니다", "오류", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
+            var currentDirection = selectedAGV.CurrentDirection;
 
             // AGV의 이전 위치에서 가장 가까운 노드 찾기
-            var prevNode = selectedAGV?.PrevNode;
+            var prevNode = selectedAGV.PrevNode;
+            var prevDir = selectedAGV.PrevDirection;
 
             // 고급 경로 계획 사용 (노드 객체 직접 전달)
-            var advancedResult = _advancedPathfinder.FindPath_test(startNode, targetNode, prevNode, currentDirection);
+            var advancedResult = _advancedPathfinder.FindPath_test(startNode, targetNode, prevNode, prevDir, currentDirection);
 
             if (advancedResult.Success)
             {