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/secret.yaml

@@ -4,7 +4,7 @@ kind: Secret
 metadata:
   name: {{ .Release.Name }}-secrets
   labels:
-    {{- include "switchboard.labels" . | nindent 4 }}
+    {{- include "armature.labels" . | nindent 4 }}
 type: Opaque
 stringData:
   JWT_SECRET: {{ required "jwtSecret is required" .Values.jwtSecret | quote }}
@@ -15,11 +15,11 @@ stringData:
   POSTGRES_PASSWORD: {{ .Values.database.postgres.password | quote }}
   {{- end }}
   {{- if .Values.admin.password }}
-  SWITCHBOARD_ADMIN_USERNAME: {{ .Values.admin.username | quote }}
-  SWITCHBOARD_ADMIN_PASSWORD: {{ .Values.admin.password | quote }}
+  ARMATURE_ADMIN_USERNAME: {{ .Values.admin.username | quote }}
+  ARMATURE_ADMIN_PASSWORD: {{ .Values.admin.password | quote }}
   {{- end }}
   {{- if .Values.admin.email }}
-  SWITCHBOARD_ADMIN_EMAIL: {{ .Values.admin.email | quote }}
+  ARMATURE_ADMIN_EMAIL: {{ .Values.admin.email | quote }}
   {{- end }}
   {{- if .Values.storage.s3.accessKey }}
   S3_ACCESS_KEY: {{ .Values.storage.s3.accessKey | quote }}