refactor: Decouple MCP server from direct DB access

Replace direct EF Core/DbContext usage in MCP tools with HTTP calls
to the CutList.Web REST API via new ApiClient. Removes CutList.Web
project reference from MCP, adds Microsoft.Extensions.Http instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CutList.Mcp/Program.cs

@@ -1,14 +1,15 @@
-using CutList.Web.Data;
-using Microsoft.EntityFrameworkCore;
+using CutList.Mcp;
 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"));
+// Register HttpClient for API calls to CutList.Web
+builder.Services.AddHttpClient<ApiClient>(client =>
+{
+    client.BaseAddress = new Uri("http://localhost:5009");
+});
 
 builder.Services
     .AddMcpServer()