feat(infra): production bootstrap — cert-manager, longhorn, monitoring

Add new bases for cert-manager (Let's Encrypt + wildcard cert), Longhorn
distributed storage, and monitoring (kube-prometheus-stack + Loki + Tempo
+ Grafana OIDC). Add cloud-init for Scaleway Elastic Metal provisioning.

Production overlay: add patches for postgres sizing, SeaweedFS volume,
OpenSearch storage, LiveKit service, Pingora host ports, resource limits,
and CNPG daily barman backups. Update cert-manager.yaml with full dnsNames
for all *.sunbeam.pt subdomains.

base/monitoring/loki-values.yaml

@@ -0,0 +1,43 @@
+# Loki — monolithic single-binary mode, filesystem storage, single tenant.
+deploymentMode: SingleBinary
+
+loki:
+  auth_enabled: false
+  commonConfig:
+    replication_factor: 1
+  storage:
+    type: filesystem
+  schemaConfig:
+    configs:
+      - from: "2024-01-01"
+        store: tsdb
+        object_store: filesystem
+        schema: v13
+        index:
+          prefix: index_
+          period: 24h
+
+singleBinary:
+  replicas: 1
+  persistence:
+    enabled: true
+    size: 30Gi
+
+# Disable sub-charts/probes not needed for single-node
+backend:
+  replicas: 0
+read:
+  replicas: 0
+write:
+  replicas: 0
+
+monitoring:
+  selfMonitoring:
+    enabled: false
+    grafanaAgent:
+      installOperator: false
+  lokiCanary:
+    enabled: false
+
+test:
+  enabled: false