CHORE(grafana): disable auto dashboard provision

- Use manual import instead of automatic provisioning
- Remove configMapGenerator for dashboards
- Remove sidecar and dashboards helm config
- Keep JSON files in dashboards/ for manual import reference

grafana/helm-values.yaml

@@ -54,43 +54,8 @@ datasources:
       jsonData:
         implementation: prometheus
 
-# Sidecar for dashboard ConfigMaps
-sidecar:
-  dashboards:
-    enabled: true
-    label: grafana_dashboard
-    labelValue: "1"
-    searchNamespace: grafana
-    folderAnnotation: grafana_folder
-    provider:
-      foldersFromFilesStructure: false
-
-# Dashboards from grafana.com (only those not in ConfigMaps)
-dashboardProviders:
-  dashboardproviders.yaml:
-    apiVersion: 1
-    providers:
-    - name: 'default'
-      orgId: 1
-      folder: ''
-      type: file
-      disableDeletion: false
-      editable: true
-      options:
-        path: /var/lib/grafana/dashboards/default
-
-dashboards:
-  default:
-    # Longhorn Storage
-    longhorn:
-      gnetId: 16888
-      revision: 9
-      datasource: Prometheus
-    # Traefik Official
-    traefik-official:
-      gnetId: 17346
-      revision: 9
-      datasource: Prometheus
+# Dashboards are manually imported via Grafana UI
+# JSON files stored in dashboards/ directory for reference
 
 grafana.ini:
   server: