Initial commit

src/PowderCoating.Core/Entities/OvenBatch.cs

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+using PowderCoating.Core.Enums;
+
+namespace PowderCoating.Core.Entities;
+
+public class OvenBatch : BaseEntity
+{
+    public string BatchNumber { get; set; } = string.Empty;
+    public int? EquipmentId { get; set; }
+    public int? OvenCostId { get; set; }
+    public OvenBatchStatus Status { get; set; } = OvenBatchStatus.Planned;
+
+    public DateTime ScheduledDate { get; set; }
+    public DateTime? ScheduledStartTime { get; set; }
+    public DateTime? EstimatedEndTime { get; set; }
+    public DateTime? ActualStartTime { get; set; }
+    public DateTime? ActualEndTime { get; set; }
+
+    public decimal TotalSurfaceAreaSqFt { get; set; }
+    public decimal? CureTemperatureF { get; set; }
+    public int CycleMinutes { get; set; } = 45;
+
+    public string? PrimaryColorName { get; set; }
+    public string? PrimaryColorCode { get; set; }
+
+    public bool AiSuggested { get; set; }
+    public string? AiReasoningJson { get; set; }
+    public string? Notes { get; set; }
+
+    // Navigation
+    public virtual Equipment? Equipment { get; set; }
+    public virtual OvenCost? OvenCost { get; set; }
+    public virtual ICollection<OvenBatchItem> Items { get; set; } = new List<OvenBatchItem>();
+}
+
+public class OvenBatchItem : BaseEntity
+{
+    public int OvenBatchId { get; set; }
+    public int JobId { get; set; }
+    public int JobItemId { get; set; }
+    public int JobItemCoatId { get; set; }
+
+    public decimal SurfaceAreaContribution { get; set; }
+    public int CoatPassNumber { get; set; } = 1;
+    public int SortOrder { get; set; }
+    public OvenBatchItemStatus Status { get; set; } = OvenBatchItemStatus.Pending;
+    public string? Notes { get; set; }
+
+    // Navigation
+    public virtual OvenBatch Batch { get; set; } = null!;
+    public virtual Job Job { get; set; } = null!;
+    public virtual JobItem JobItem { get; set; } = null!;
+    public virtual JobItemCoat JobItemCoat { get; set; } = null!;
+}