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/openapi_test.go

@@ -5,17 +5,17 @@ import (
 	"encoding/json"
 	"testing"
 
-	"switchboard-core/database"
-	"switchboard-core/store"
-	postgres "switchboard-core/store/postgres"
-	sqlite "switchboard-core/store/sqlite"
+	"armature/database"
+	"armature/store"
+	postgres "armature/store/postgres"
+	sqlite "armature/store/sqlite"
 )
 
 // Minimal static spec for testing — valid OpenAPI 3.0 structure.
 var testStaticSpec = []byte(`
 openapi: "3.0.3"
 info:
-  title: Switchboard Core
+  title: Armature
   version: "${VERSION}"
 paths:
   /api/v1/health: