refactor: Rename Project to Job with enhanced model

Rename the Project concept to Job for clarity:
- Add Job, JobPart, JobStock entities
- JobStock supports both inventory stock and custom lengths
- Add JobNumber field for job identification
- Add priority-based stock allocation for cut optimization
- Include Jobs UI pages (Index, Edit, Results)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Data/Entities/JobPart.cs

@@ -0,0 +1,15 @@
+namespace CutList.Web.Data.Entities;
+
+public class JobPart
+{
+    public int Id { get; set; }
+    public int JobId { get; set; }
+    public int MaterialId { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public decimal LengthInches { get; set; }
+    public int Quantity { get; set; } = 1;
+    public int SortOrder { get; set; }
+
+    public Job Job { get; set; } = null!;
+    public Material Material { get; set; } = null!;
+}