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/_helpers.tpl

@@ -1,7 +1,7 @@
 {{/*
 Common labels
 */}}
-{{- define "switchboard.labels" -}}
+{{- define "armature.labels" -}}
 app.kubernetes.io/name: {{ .Chart.Name }}
 app.kubernetes.io/instance: {{ .Release.Name }}
 app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
@@ -12,23 +12,23 @@ helm.sh/chart: {{ .Chart.Name }}-{{ .Chart.Version }}
 {{/*
 Backend selector labels
 */}}
-{{- define "switchboard.backend.labels" -}}
+{{- define "armature.backend.labels" -}}
 app.kubernetes.io/component: backend
-{{ include "switchboard.labels" . }}
+{{ include "armature.labels" . }}
 {{- end }}
 
 {{/*
 Frontend selector labels
 */}}
-{{- define "switchboard.frontend.labels" -}}
+{{- define "armature.frontend.labels" -}}
 app.kubernetes.io/component: frontend
-{{ include "switchboard.labels" . }}
+{{ include "armature.labels" . }}
 {{- end }}
 
 {{/*
 Secret name
 */}}
-{{- define "switchboard.secretName" -}}
+{{- define "armature.secretName" -}}
 {{- if .Values.existingSecret -}}
 {{ .Values.existingSecret }}
 {{- else -}}
@@ -39,21 +39,21 @@ Secret name
 {{/*
 Backend image
 */}}
-{{- define "switchboard.backend.image" -}}
+{{- define "armature.backend.image" -}}
 {{ .Values.backend.image.repository }}:{{ .Values.backend.image.tag | default .Chart.AppVersion }}
 {{- end }}
 
 {{/*
 Frontend image
 */}}
-{{- define "switchboard.frontend.image" -}}
+{{- define "armature.frontend.image" -}}
 {{ .Values.frontend.image.repository }}:{{ .Values.frontend.image.tag | default .Chart.AppVersion }}
 {{- end }}
 
 {{/*
 Database URL — assembled from postgres.* if url is empty
 */}}
-{{- define "switchboard.databaseURL" -}}
+{{- define "armature.databaseURL" -}}
 {{- if .Values.database.url -}}
 {{ .Values.database.url }}
 {{- else if eq .Values.database.driver "sqlite" -}}