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/go.mod

@@ -1,4 +1,4 @@
-module switchboard-core
+module armature
 
 go 1.23.0
 
@@ -14,7 +14,7 @@ require (
 	github.com/robfig/cron/v3 v3.0.1
 	go.starlark.net v0.0.0-20260210143700-b62fd896b91b
 	golang.org/x/crypto v0.41.0
-	golang.org/x/net v0.43.0
+	gopkg.in/yaml.v3 v3.0.1
 	modernc.org/sqlite v1.34.5
 )
 
@@ -52,10 +52,10 @@ require (
 	github.com/ugorji/go/codec v1.2.11 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	golang.org/x/arch v0.3.0 // indirect
+	golang.org/x/net v0.43.0 // indirect
 	golang.org/x/sys v0.35.0 // indirect
 	golang.org/x/text v0.28.0 // indirect
 	google.golang.org/protobuf v1.36.8 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	modernc.org/libc v1.55.3 // indirect
 	modernc.org/mathutil v1.6.0 // indirect
 	modernc.org/memory v1.8.0 // indirect