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/storage/s3.go

@@ -21,7 +21,7 @@ type S3Config struct {
 	Region         string // AWS region (default "us-east-1")
 	AccessKey      string // access key ID
 	SecretKey      string // secret access key
-	Prefix         string // optional key prefix (e.g. "switchboard/")
+	Prefix         string // optional key prefix (e.g. "armature/")
 	ForcePathStyle bool   // path-style URLs (required for MinIO, most self-hosted)
 	UseSSL         bool   // use HTTPS (derived from endpoint scheme)
 }
@@ -31,7 +31,7 @@ type S3Config struct {
 type S3Store struct {
 	client   *minio.Client
 	bucket   string
-	prefix   string // prepended to all keys (e.g. "switchboard/")
+	prefix   string // prepended to all keys (e.g. "armature/")
 	endpoint string // original endpoint for display in Stats
 }