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>

server/notifications/templates_test.go

@@ -4,7 +4,7 @@ import (
 	"strings"
 	"testing"
 
-	"switchboard-core/models"
+	"armature/models"
 )
 
 func TestRenderHTML_Basic(t *testing.T) {
@@ -28,7 +28,7 @@ func TestRenderHTML_Basic(t *testing.T) {
 func TestRenderHTML_DefaultInstanceName(t *testing.T) {
 	n := &models.Notification{Title: "Test"}
 	html := RenderHTML(n, "")
-	if !strings.Contains(html, "Switchboard Core") {
+	if !strings.Contains(html, "Armature") {
 		t.Error("expected default instance name")
 	}
 }