fix: add WithHttpTransport() for HTTP mode and add k8s manifests

HTTP transport mode was missing the required WithHttpTransport() call,
causing MapMcp() to fail. Also adds Kubernetes manifests for deployment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

PaperlessMCP/Program.cs

@@ -38,6 +38,7 @@ else
 
     builder.Services
         .AddMcpServer()
+        .WithHttpTransport()
         .WithToolsFromAssembly();
 
     var app = builder.Build();
@@ -45,7 +46,7 @@ else
     var port = app.Configuration.GetValue<int?>("Mcp:Port")
                ?? (Environment.GetEnvironmentVariable("MCP_PORT") is string portStr && int.TryParse(portStr, out var p) ? p : 5000);
 
-    app.MapMcp("/mcp");
+    app.MapMcp();
 
     app.Logger.LogInformation("PaperlessMCP server starting on port {Port}", port);
     app.Logger.LogInformation("MCP endpoint available at: http://localhost:{Port}/mcp", port);