Port the observability platform to k3s and ship czy logs to it

k8s/ is now a faithful port of the mentor's Ansible Grafana stack
(Prometheus, Alertmanager, Loki, Tempo, Alloy, Grafana, node-exporter)
for the ledgerline-observability namespace on falken: same versions and
configs, one *.vione.cloud ingress per tool behind Traefik basic auth,
secrets generated by create-secrets.sh into gitignored files.

Two fixes over the Ansible role, both verified live: Tempo's
metrics-generator needs traces_storage or it runs no processors, and
Prometheus needs exemplar-storage to keep exemplars.

Ledgerline stays on czy; an Alloy agent in the Traefik override ships
its container logs to Loki. Roadmap and CLAUDE.md now point at k8s/.

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

k8s/grafana/deployment.yaml

@@ -0,0 +1,60 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: grafana
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: grafana
+  template:
+    metadata:
+      labels:
+        app: grafana
+    spec:
+      containers:
+        - name: grafana
+          image: grafana/grafana:12.1.1
+          ports:
+            - containerPort: 3000
+          env:
+            - name: GF_SECURITY_ADMIN_USER
+              valueFrom:
+                secretKeyRef:
+                  name: grafana-admin
+                  key: admin-user
+            - name: GF_SECURITY_ADMIN_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: grafana-admin
+                  key: admin-password
+            - name: GF_USERS_ALLOW_SIGN_UP
+              value: "false"
+            - name: GF_FEATURE_TOGGLES_ENABLE
+              value: traceqlEditor
+            - name: GF_SERVER_ROOT_URL
+              value: https://grafana.vione.cloud
+          readinessProbe:
+            httpGet:
+              path: /api/health
+              port: 3000
+          resources:
+            requests:
+              cpu: 20m
+              memory: 128Mi
+            limits:
+              memory: 512Mi
+          volumeMounts:
+            - name: data
+              mountPath: /var/lib/grafana
+            - name: datasources
+              mountPath: /etc/grafana/provisioning/datasources
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: grafana-data
+        - name: datasources
+          configMap:
+            name: grafana-datasources