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>

chart/values.yaml

@@ -1,10 +1,10 @@
-# Switchboard Core — Helm values
-# helm install switchboard ./chart
+# Armature — Helm values
+# helm install armature ./chart
 
 # ── Images ─────────────────────────────────
 backend:
   image:
-    repository: git.gobha.me/switchboard/core
+    repository: git.gobha.me/armature/core
     tag: ""  # defaults to Chart.appVersion
     pullPolicy: IfNotPresent
   replicaCount: 2  # v0.32.0: multi-replica HA
@@ -19,7 +19,7 @@ backend:
 
 frontend:
   image:
-    repository: git.gobha.me/switchboard/core
+    repository: git.gobha.me/armature/core
     tag: ""  # defaults to Chart.appVersion
     pullPolicy: IfNotPresent
   replicaCount: 1
@@ -41,12 +41,12 @@ database:
   postgres:
     host: postgresql
     port: 5432
-    user: switchboard
+    user: armature
     password: ""  # set via secret
-    database: switchboard
+    database: armature
     sslmode: disable
   # For sqlite: path inside the container (requires persistence)
-  sqlitePath: /data/switchboard.db
+  sqlitePath: /data/armature.db
 
 # ── Core ───────────────────────────────────
 basePath: ""  # URL prefix, e.g. "/dev"
@@ -85,7 +85,7 @@ ingress:
   enabled: true
   className: traefik
   annotations: {}
-  host: switchboard.local
+  host: armature.local
   tls:
     enabled: false
     secretName: ""