Add Kubernetes manifests for car.stinnesbeck.com

Namespace, InfluxDB 2.7.12 StatefulSet with PVC and a NetworkPolicy
that admits only the server, the server Deployment (non-root, read-only
root filesystem), a cert-manager Certificate from letsencrypt-prod and a
Traefik IngressRoute. Secrets are a template only. Nothing is applied;
k8s/README.md has the steps. Server version bumped to 1.1.0.

Validated offline with kustomize and kubeconform (including the
cert-manager and Traefik CRD schemas). The InfluxDB container was tested
locally as UID 1000 with no capabilities.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

k8s/server.yaml

@@ -0,0 +1,103 @@
+# The car server. One replica on purpose: the ABRP rate limit is kept in memory, and two
+# replicas would each forward to ABRP at the full rate.
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mg4-server
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: mg4-server
+    app.kubernetes.io/part-of: mg4
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: mg4-server
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: mg4-server
+        app.kubernetes.io/part-of: mg4
+    spec:
+      # Needed only if the image is private on git.stinnesbeck.com; see secrets.example.yaml.
+      imagePullSecrets:
+        - name: git-stinnesbeck-registry
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 10001
+        runAsGroup: 10001
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: server
+          image: git.stinnesbeck.com/nils/mg4-server:latest # pinned by kustomization.yaml
+          ports:
+            - name: http
+              containerPort: 3000
+          env:
+            - name: INFLUX_URL
+              value: http://influxdb.mg4.svc:8086
+            - name: INFLUX_ORG
+              value: mg4
+            - name: INFLUX_BUCKET
+              value: mg4
+            - name: INFLUX_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: influxdb-auth
+                  key: admin-token
+          # INGEST_TOKEN, SESSION_SECRET, DASHBOARD_PASSWORD, ABRP_API_KEY, ABRP_USER_TOKEN.
+          envFrom:
+            - secretRef:
+                name: mg4-server
+          readinessProbe:
+            httpGet:
+              path: /v1/health
+              port: http
+            periodSeconds: 10
+          livenessProbe:
+            httpGet:
+              path: /v1/health
+              port: http
+            initialDelaySeconds: 10
+            periodSeconds: 30
+          resources:
+            requests:
+              cpu: 50m
+              memory: 128Mi
+            limits:
+              memory: 512Mi
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+          volumeMounts:
+            # Next.js writes its fetch/image cache here; the rest of the filesystem is read-only.
+            - name: next-cache
+              mountPath: /app/.next/cache
+            - name: tmp
+              mountPath: /tmp
+      volumes:
+        - name: next-cache
+          emptyDir: {}
+        - name: tmp
+          emptyDir: {}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mg4-server
+  namespace: mg4
+  labels:
+    app.kubernetes.io/name: mg4-server
+    app.kubernetes.io/part-of: mg4
+spec:
+  selector:
+    app.kubernetes.io/name: mg4-server
+  ports:
+    - name: http
+      port: 80
+      targetPort: http