first commit

src/App.Core/Entities/Machines/Machine.cs

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+using App.Core.Entities.Inventory;
+using App.Core.Entities.Maintenance;
+
+namespace App.Core.Entities.Machines;
+
+/// <summary>
+/// Équipement industriel soumis à maintenance préventive et/ou curative.
+/// </summary>
+public class Machine
+{
+    public int Id { get; set; }
+
+    public required string Reference { get; set; }
+
+    public required string Designation { get; set; }
+
+    public string? Location { get; set; }
+
+    public MachineCriticality Criticality { get; set; }
+
+    public DateOnly? CommissioningDate { get; set; }
+
+    public int? PhotoAttachmentId { get; set; }
+
+    /// <summary>Désactivation logique (soft delete) : une machine liée à un historique n'est jamais supprimée physiquement.</summary>
+    public bool IsActive { get; set; } = true;
+
+    public DateTime CreatedAtUtc { get; set; }
+
+    public DateTime UpdatedAtUtc { get; set; }
+
+    public List<MaintenancePlan> MaintenancePlans { get; set; } = [];
+
+    public List<WorkOrder> WorkOrders { get; set; } = [];
+
+    public List<MachinePart> MachineParts { get; set; } = [];
+
+    public List<MachineCounterReading> CounterReadings { get; set; } = [];
+}