feat: Add CutList.Web Blazor Server application

Add a new web-based frontend for cut list optimization using:
- Blazor Server with .NET 8
- Entity Framework Core with MSSQL LocalDB
- Full CRUD for Materials, Suppliers, Projects, and Cutting Tools
- Supplier stock length management for quick project setup
- Integration with CutList.Core for bin packing optimization
- Print-friendly HTML reports with efficiency statistics

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

CutList.Web/Data/Entities/Supplier.cs

@@ -0,0 +1,13 @@
+namespace CutList.Web.Data.Entities;
+
+public class Supplier
+{
+    public int Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? ContactInfo { get; set; }
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public ICollection<SupplierStock> Stocks { get; set; } = new List<SupplierStock>();
+}