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/handlers/backup.go

@@ -16,8 +16,8 @@ import (
 
 	"github.com/gin-gonic/gin"
 
-	"switchboard-core/database"
-	"switchboard-core/store"
+	"armature/database"
+	"armature/store"
 )
 
 // BackupHandler provides backup/restore endpoints for admin users.
@@ -101,7 +101,7 @@ func (h *BackupHandler) CreateBackup(c *gin.Context) {
 	}
 
 	// Stream directly to client
-	filename := fmt.Sprintf("switchboard-%s-%s.swb", meta.Version, meta.Timestamp.Format("20060102-150405"))
+	filename := fmt.Sprintf("armature-%s-%s.swb", meta.Version, meta.Timestamp.Format("20060102-150405"))
 	c.Header("Content-Type", "application/zip")
 	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=%q", filename))
 
@@ -119,7 +119,7 @@ func (h *BackupHandler) createStoredBackup(c *gin.Context, ctx interface{ Deadli
 	}
 	os.MkdirAll(dir, 0755)
 
-	filename := fmt.Sprintf("switchboard-%s-%s.swb", meta.Version, meta.Timestamp.Format("20060102-150405"))
+	filename := fmt.Sprintf("armature-%s-%s.swb", meta.Version, meta.Timestamp.Format("20060102-150405"))
 	path := filepath.Join(dir, filename)
 
 	f, err := os.Create(path)