feat: Add MCP inventory management tools

Add comprehensive MCP tools for inventory management:
- list_suppliers, add_supplier
- list_materials, add_material, search_materials
- list_stock_items, add_stock_item
- list_supplier_offerings, add_supplier_offering
- add_stock_with_offering (convenience method)

Features:
- Dimension-based material search with tolerance
- Auto-generate size strings from dimensions
- Parse size strings to typed dimensions
- Type/Grade support for material categorization

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

CutList.Mcp/Program.cs

@@ -1,9 +1,15 @@
+using CutList.Web.Data;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using ModelContextProtocol.Server;
 
 var builder = Host.CreateApplicationBuilder(args);
 
+// Add DbContext for inventory tools
+builder.Services.AddDbContext<ApplicationDbContext>(options =>
+    options.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=CutListDb;Trusted_Connection=True;MultipleActiveResultSets=true"));
+
 builder.Services
     .AddMcpServer()
     .WithStdioServerTransport()