Initial commit

srcs/RobotNet10/Commons/RobotNet10.MapManager/Data/Node.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace RobotNet10.MapManager.Data;
+
+/// <summary>
+/// Node entity - Waypoints/nodes on the map
+/// Maps to VDMA LIF: layouts[].nodes[]
+/// </summary>
+[Table("Nodes")]
+public class Node
+{
+    [Key]
+    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// Parent level reference
+    /// </summary>
+    [Required]
+    public Guid LevelId { get; set; }
+
+    /// <summary>
+    /// Node identifier (VDMA LIF: nodeId) - Required
+    /// Unique within level
+    /// </summary>
+    [Required]
+    [StringLength(128)]
+    public string NodeId { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Node name (VDMA LIF: nodeName) - Optional
+    /// </summary>
+    [StringLength(256)]
+    public string? NodeName { get; set; }
+
+    /// <summary>
+    /// Node description (VDMA LIF: nodeDescription) - Optional
+    /// </summary>
+    public string? NodeDescription { get; set; }
+
+    /// <summary>
+    /// Map identifier (VDMA LIF: mapId) - Optional
+    /// Reference to map image or data
+    /// </summary>
+    [StringLength(128)]
+    public string? MapId { get; set; }
+
+    /// <summary>
+    /// X coordinate in meters (VDMA LIF: nodePosition.x) - Required
+    /// </summary>
+    [Required]
+    public double X { get; set; }
+
+    /// <summary>
+    /// Y coordinate in meters (VDMA LIF: nodePosition.y) - Required
+    /// </summary>
+    [Required]
+    public double Y { get; set; }
+
+    // Navigation properties
+    [ForeignKey(nameof(LevelId))]
+    public virtual LayoutLevel Level { get; set; } = null!;
+
+    public virtual ICollection<NodeVehicleProperty> VehicleProperties { get; set; } = new List<NodeVehicleProperty>();
+    public virtual ICollection<Edge> OutgoingEdges { get; set; } = new List<Edge>();
+    public virtual ICollection<Edge> IncomingEdges { get; set; } = new List<Edge>();
+    public virtual ICollection<StationInteractionNode> StationInteractions { get; set; } = new List<StationInteractionNode>();
+}
+