fix: RFID duplicate validation and correct magnet direction calculation

- Add real-time RFID duplicate validation in map editor with automatic rollback
- Remove RFID auto-assignment to maintain data consistency between editor and simulator
- Fix magnet direction calculation to use actual forward direction angles instead of arbitrary assignment
- Add node names to simulator combo boxes for better identification
- Improve UI layout by drawing connection lines before text for better visibility

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Cs_HMI/AGVNavigationCore/Models/MapNode.cs

@@ -69,10 +69,6 @@ namespace AGVNavigationCore.Models
         /// </summary>
         public DateTime ModifiedDate { get; set; } = DateTime.Now;
 
-        /// <summary>
-        /// 노드 설명 (추가 정보)
-        /// </summary>
-        public string Description { get; set; } = string.Empty;
 
         /// <summary>
         /// 노드 활성화 여부
@@ -289,9 +285,9 @@ namespace AGVNavigationCore.Models
             {
                 var displayText = NodeId;
                 
-                if (!string.IsNullOrEmpty(Description))
+                if (!string.IsNullOrEmpty(Name))
                 {
-                    displayText += $" - {Description}";
+                    displayText += $" - {Name}";
                 }
                 
                 if (!string.IsNullOrEmpty(RfidId))
@@ -322,7 +318,6 @@ namespace AGVNavigationCore.Models
                 StationType = StationType,
                 CreatedDate = CreatedDate,
                 ModifiedDate = ModifiedDate,
-                Description = Description,
                 IsActive = IsActive,
                 DisplayColor = DisplayColor,
                 RfidId = RfidId,