Provision MeshCore Grafana dashboard

Add the MeshCore dashboard (exported from prod) as a provisioned file
dashboard, with a file provider config. Pin the ClickHouse datasource
uid to "clickhouse" so the dashboard's panel datasource references
resolve at provision time.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

grafana/provisioning/dashboards/dashboards.yaml

@@ -0,0 +1,13 @@
+apiVersion: 1
+
+providers:
+  - name: MeshCore
+    orgId: 1
+    type: file
+    disableDeletion: false
+    # Allow edits in the UI without them being reverted on the next scan.
+    allowUiUpdates: true
+    updateIntervalSeconds: 30
+    options:
+      path: /etc/grafana/provisioning/dashboards/json
+      foldersFromFilesStructure: false

grafana/provisioning/datasources/clickhouse.yaml

@@ -3,6 +3,8 @@ apiVersion: 1
 datasources:
   - name: ClickHouse
     type: grafana-clickhouse-datasource
+    # Pinned uid so the provisioned MeshCore dashboard's panel references resolve.
+    uid: clickhouse
     access: proxy
     isDefault: true
     jsonData: