feat: add PepMcp server for MCP tool integration

Add new MCP (Model Context Protocol) server project that exposes PEP API
functionality as tools for LLM integration. Includes tools for:
- Nest queries (list, details, plates)
- Part search across programs
- Material analytics (usage, plate sizes, thickness breakdown)
- Customer usage analysis
- Stock recommendations
- Materials to order for pending programs

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

PepMcp/Program.cs

@@ -0,0 +1,11 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+var builder = Host.CreateApplicationBuilder(args);
+builder.Services
+    .AddMcpServer()
+    .WithStdioServerTransport()
+    .WithTools<PepTools>();
+
+var app = builder.Build();
+await app.RunAsync();