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>

k8s/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: paperless-mcp
+  labels:
+    app: paperless-mcp
+spec:
+  type: ClusterIP
+  selector:
+    app: paperless-mcp
+  ports:
+    - port: 5000
+      targetPort: 5000
+      protocol: TCP
+      name: http