feat(ops): add Makefile, Dockerfile, and K8s manifests

k8s/cronjob.yaml

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+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: tutortool-backup
+spec:
+  schedule: "0 3 * * *"
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          containers:
+          - name: backup
+            image: alpine:latest
+            command:
+            - /bin/sh
+            - -c
+            - |
+              apk add --no-cache sqlite
+              sqlite3 /data/attendance.db "VACUUM INTO '/data/backup-$(date +%F).sqlite'"
+              find /data -name "backup-*.sqlite" -mtime +7 -delete
+            volumeMounts:
+            - name: db-storage
+              mountPath: /data
+          restartPolicy: OnFailure
+          volumes:
+          - name: db-storage
+            persistentVolumeClaim:
+              claimName: tutortool-pvc

k8s/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: tutortool
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: tutortool
+  template:
+    metadata:
+      labels:
+        app: tutortool
+    spec:
+      containers:
+      - name: app
+        image: tutor-registry:latest
+        ports:
+        - containerPort: 3000
+        env:
+        - name: DATABASE_URL
+          value: "sqlite:/data/attendance.db"
+        - name: STATIC_DIR
+          value: "/app/frontend/build"
+        volumeMounts:
+        - name: db-storage
+          mountPath: /data
+      volumes:
+      - name: db-storage
+        persistentVolumeClaim:
+          claimName: tutortool-pvc
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: tutortool
+spec:
+  selector:
+    app: tutortool
+  ports:
+  - port: 80
+    targetPort: 3000
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: tutortool-ingress
+spec:
+  rules:
+  - host: tutor.puchstein.dev
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: tutortool
+            port:
+              number: 80

k8s/pvc.yaml

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