feat: Add Kubernetes manifests for NetHack server

- Creates Kubernetes deployment, service, and PVC manifests to run a multiplayer NetHack server.
- Uses the pre-built matsuu/nethack-server:latest image.
- Configures the service to expose port 4000 externally and correctly route traffic to the container's port 23.
- Adds a .gitignore file to exclude temporary directories.

.gitignore

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+# Temporary directories used for troubleshooting
+nethack-repo/
+nethack-server-docker/

GEMINI.md

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+# GEMINI.md - NetHack Multiplayer Server su Kubernetes
+
+namespace: nethack
+
+# Deployment del server NetHack
+deployment:
+  name: nethack-server
+  replicas: 1
+  labels:
+    app: nethack
+  container:
+    image: matsuu/nethack-server:latest
+    name: nethack
+    ports:
+      - containerPort: 4000
+    env:
+      - name: DGL_PORT
+        value: "4000"
+      - name: DGL_HOST
+        value: "0.0.0.0"
+    volumeMounts:
+      - name: nethack-data
+        mountPath: /opt/nethack/data
+
+  volumes:
+    - name: nethack-data
+      persistentVolumeClaim:
+        claimName: nethack-pvc
+
+# PersistentVolumeClaim per salvataggi e configurazioni
+pvc:
+  name: nethack-pvc
+  accessModes: [ "ReadWriteOnce" ]
+  resources:
+    requests:
+      storage: 1Gi
+
+# Service ClusterIP interno
+service:
+  name: nethack-service
+  type: LoadBalancer
+  ports:
+    - port: 4000
+      targetPort: 4000
+      protocol: TCP
+  selector:
+    app: nethack

k8s/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nethack-server
+  namespace: nethack
+  labels:
+    app: nethack
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nethack
+  template:
+    metadata:
+      labels:
+        app: nethack
+    spec:
+      containers:
+      - name: nethack
+        image: matsuu/nethack-server:latest
+        ports:
+        - containerPort: 23
+        env:
+        - name: DGL_PORT
+          value: "4000"
+        - name: DGL_HOST
+          value: "0.0.0.0"
+        volumeMounts:
+        - name: nethack-data
+          mountPath: /opt/nethack/data
+      volumes:
+      - name: nethack-data
+        persistentVolumeClaim:
+          claimName: nethack-pvc

k8s/pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: nethack-pvc
+  namespace: nethack
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi

k8s/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nethack-service
+  namespace: nethack
+spec:
+  type: LoadBalancer
+  selector:
+    app: nethack
+  ports:
+    - protocol: TCP
+      port: 4000
+      targetPort: 23