chore: Remove deprecated Project entities and pages

Remove files superseded by the Job model:
- Project, ProjectPart entities (replaced by Job, JobPart, JobStock)
- ProjectService (replaced by JobService)
- Projects UI pages (replaced by Jobs pages)
- MaterialStockLength entity (consolidated into StockItem)

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

CutList.Web/Data/Entities/MaterialStockLength.cs

@@ -1,13 +0,0 @@
-namespace CutList.Web.Data.Entities;
-
-public class MaterialStockLength
-{
-    public int Id { get; set; }
-    public int MaterialId { get; set; }
-    public decimal LengthInches { get; set; }
-    public int Quantity { get; set; } = 0;
-    public string? Notes { get; set; }
-    public bool IsActive { get; set; } = true;
-
-    public Material Material { get; set; } = null!;
-}

CutList.Web/Data/Entities/Project.cs

@@ -1,15 +0,0 @@
-namespace CutList.Web.Data.Entities;
-
-public class Project
-{
-    public int Id { get; set; }
-    public string Name { get; set; } = string.Empty;
-    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<ProjectPart> Parts { get; set; } = new List<ProjectPart>();
-}

CutList.Web/Data/Entities/ProjectPart.cs

@@ -1,15 +0,0 @@
-namespace CutList.Web.Data.Entities;
-
-public class ProjectPart
-{
-    public int Id { get; set; }
-    public int ProjectId { 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 Project Project { get; set; } = null!;
-    public Material Material { get; set; } = null!;
-}