Initial commit

src/PowderCoating.Core/Entities/JobPrepService.cs

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+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace PowderCoating.Core.Entities
+{
+    /// <summary>
+    /// Join table for the many-to-many relationship between Jobs and PrepServices
+    /// </summary>
+    public class JobPrepService : BaseEntity
+    {
+        public int JobId { get; set; }
+        public int PrepServiceId { get; set; }
+
+        // Navigation properties
+        [ForeignKey(nameof(JobId))]
+        public virtual Job Job { get; set; } = null!;
+
+        [ForeignKey(nameof(PrepServiceId))]
+        public virtual PrepService PrepService { get; set; } = null!;
+    }
+}