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/Job.cs

@@ -0,0 +1,19 @@
+namespace CutList.Web.Data.Entities;
+
+public class Job
+{
+    public int Id { get; set; }
+    public string JobNumber { get; set; } = string.Empty;
+    public string? Name { get; set; }
+    public string? Customer { get; set; }
+    public int? CuttingToolId { get; set; }
+    public string? Notes { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+
+    public CuttingTool? CuttingTool { get; set; }
+    public ICollection<JobPart> Parts { get; set; } = new List<JobPart>();
+    public ICollection<JobStock> Stock { get; set; } = new List<JobStock>();
+
+    public string DisplayName => string.IsNullOrWhiteSpace(Name) ? JobNumber : $"{JobNumber} - {Name}";
+}