feat: split Grafana dashboards into per-folder ConfigMaps

Replace monolithic dashboards-configmap.yaml with 10 dedicated files,
one per Grafana folder: Ingress, Observability, Infrastructure, Storage,
Identity, DevTools, Search, Media, La Suite, Communications.

New dashboards for Longhorn, PostgreSQL/CNPG, Cert-Manager, SeaweedFS,
Hydra, Kratos, Gitea, OpenSearch, LiveKit, La Suite golden signals
(Linkerd metrics), Matrix, and Email Pipeline.

base/monitoring/dashboards-devtools.yaml

@@ -0,0 +1,89 @@
+# Grafana dashboard ConfigMaps — DevTools
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: grafana-dashboard-gitea
+  namespace: monitoring
+  labels:
+    grafana_dashboard: "1"
+  annotations:
+    grafana_folder: "DevTools"
+data:
+  gitea.json: |
+    {
+      "annotations": { "list": [] },
+      "editable": true,
+      "panels": [
+        {
+          "title": "Repositories",
+          "type": "stat",
+          "gridPos": { "h": 4, "w": 8, "x": 0, "y": 0 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            { "expr": "gitea_repositories", "legendFormat": "repos" }
+          ]
+        },
+        {
+          "title": "Users",
+          "type": "stat",
+          "gridPos": { "h": 4, "w": 8, "x": 8, "y": 0 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            { "expr": "gitea_users", "legendFormat": "users" }
+          ]
+        },
+        {
+          "title": "Issues",
+          "type": "stat",
+          "gridPos": { "h": 4, "w": 8, "x": 16, "y": 0 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            { "expr": "gitea_issues", "legendFormat": "issues" }
+          ]
+        },
+        {
+          "title": "Go Goroutines",
+          "type": "timeseries",
+          "gridPos": { "h": 8, "w": 8, "x": 0, "y": 4 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            {
+              "expr": "go_goroutines{job=~\".*gitea.*\"}",
+              "legendFormat": "{{instance}}"
+            }
+          ]
+        },
+        {
+          "title": "Memory Usage",
+          "type": "timeseries",
+          "gridPos": { "h": 8, "w": 8, "x": 8, "y": 4 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            {
+              "expr": "process_resident_memory_bytes{job=~\".*gitea.*\"}",
+              "legendFormat": "{{instance}}"
+            }
+          ],
+          "fieldConfig": { "defaults": { "unit": "bytes" } }
+        },
+        {
+          "title": "CPU Usage",
+          "type": "timeseries",
+          "gridPos": { "h": 8, "w": 8, "x": 16, "y": 4 },
+          "datasource": { "uid": "prometheus" },
+          "targets": [
+            {
+              "expr": "rate(process_cpu_seconds_total{job=~\".*gitea.*\"}[5m])",
+              "legendFormat": "{{instance}}"
+            }
+          ],
+          "fieldConfig": { "defaults": { "unit": "short" } }
+        }
+      ],
+      "schemaVersion": 39,
+      "tags": ["gitea", "devtools"],
+      "time": { "from": "now-1h", "to": "now" },
+      "title": "Gitea",
+      "uid": "gitea"
+    }