rebrand: Switchboard Core → Armature

- Rename Go module switchboard-core → armature (155+ files)
- Rename Docker image → gobha/armature
- Rename K8s resources, secrets, deployments
- Rename Prometheus metrics switchboard_* → armature_*
- Rename env vars SWITCHBOARD_ADMIN_* → ARMATURE_ADMIN_*
- Rename DB names switchboard_core* → armature*
- Update all frontend branding, notification templates, docs
- Update CI scripts, e2e tests, Keycloak realm, nginx conf
- Rename scripts/switchboard-ca.sh → scripts/armature-ca.sh
- Rename k8s/switchboard.yaml → k8s/armature.yaml
- Rename chart alerting/dashboard files
- Fix: DockerHub push uses env: binding for secret injection
- Helm chart updated (name, labels, template functions, dashboard, alerting)
- Replace favicon/icon assets with Armature brand

No functional changes. Pure mechanical rename + CI fix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

chart/templates/cronjob-backup.yaml

@@ -4,7 +4,7 @@ kind: CronJob
 metadata:
   name: {{ .Release.Name }}-backup
   labels:
-    {{- include "switchboard.labels" . | nindent 4 }}
+    {{- include "armature.labels" . | nindent 4 }}
     app.kubernetes.io/component: backup
 spec:
   schedule: {{ .Values.backup.schedule | quote }}
@@ -35,7 +35,7 @@ spec:
                 - |
                   set -e
                   TIMESTAMP=$(date +%Y%m%d-%H%M%S)
-                  FILENAME="switchboard-${TIMESTAMP}.sql.gz"
+                  FILENAME="armature-${TIMESTAMP}.sql.gz"
 
                   echo "Starting backup: ${FILENAME}"
                   pg_dump "${DATABASE_URL}" | gzip > "/backup/${FILENAME}"
@@ -58,22 +58,22 @@ spec:
 
                   # Prune old local backups beyond retention
                   cd /backup
-                  ls -t switchboard-*.sql.gz 2>/dev/null | tail -n +{{ add1 .Values.backup.retention }} | xargs -r rm -v
+                  ls -t armature-*.sql.gz 2>/dev/null | tail -n +{{ add1 .Values.backup.retention }} | xargs -r rm -v
                   echo "Backup complete"
               env:
                 - name: DATABASE_URL
-                  value: {{ include "switchboard.databaseURL" . | quote }}
+                  value: {{ include "armature.databaseURL" . | quote }}
                 {{- if .Values.backup.s3.enabled }}
                 - name: S3_ACCESS_KEY
                   valueFrom:
                     secretKeyRef:
-                      name: {{ include "switchboard.secretName" . }}
+                      name: {{ include "armature.secretName" . }}
                       key: BACKUP_S3_ACCESS_KEY
                       optional: true
                 - name: S3_SECRET_KEY
                   valueFrom:
                     secretKeyRef:
-                      name: {{ include "switchboard.secretName" . }}
+                      name: {{ include "armature.secretName" . }}
                       key: BACKUP_S3_SECRET_KEY
                       optional: true
                 {{- end }}