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.go

@@ -5,7 +5,7 @@ import (
 	"html/template"
 	"strings"
 
-	"switchboard-core/models"
+	"armature/models"
 )
 
 // ── Template Data ───────────────────────────
@@ -54,7 +54,7 @@ Adjust your notification preferences in Settings.
 // RenderHTML renders an HTML email body for a notification.
 func RenderHTML(n *models.Notification, instanceName string) string {
 	if instanceName == "" {
-		instanceName = "Switchboard Core"
+		instanceName = "Armature"
 	}
 	data := emailData{
 		Title:        n.Title,
@@ -73,7 +73,7 @@ func RenderHTML(n *models.Notification, instanceName string) string {
 // RenderText renders a plaintext email body for a notification.
 func RenderText(n *models.Notification, instanceName string) string {
 	if instanceName == "" {
-		instanceName = "Switchboard Core"
+		instanceName = "Armature"
 	}
 	data := emailData{
 		Title:        n.Title,
@@ -92,7 +92,7 @@ func RenderText(n *models.Notification, instanceName string) string {
 // SubjectForNotification returns an email subject line.
 func SubjectForNotification(n *models.Notification, instanceName string) string {
 	if instanceName == "" {
-		instanceName = "Switchboard Core"
+		instanceName = "Armature"
 	}
 	prefix := "[" + instanceName + "] "
 	switch {