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/static/openapi.yaml

@@ -1,6 +1,6 @@
 openapi: 3.0.3
 info:
-  title: Switchboard Core API
+  title: Armature API
   description: |
     Self-hosted extension platform. Identity, teams, permissions, workflows,
     and a package system. Everything else ships as installable extensions.
@@ -4820,7 +4820,7 @@ paths:
   /api/v1/hooks/{package_id}/{slug}:
     post:
       summary: Inbound webhook trigger
-      description: Public endpoint. HMAC-SHA256 verified via X-Switchboard-Signature header.
+      description: Public endpoint. HMAC-SHA256 verified via X-Armature-Signature header.
       operationId: webhookInbound
       tags: [Triggers]
       security: []

server/static/swagger.html

@@ -4,7 +4,7 @@
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <meta name="color-scheme" content="light dark" />
-  <title>Switchboard Core — API Docs</title>
+  <title>Armature — API Docs</title>
   <link rel="stylesheet" href="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css" />
   <style>
     /* ── Palette — WCAG AA 4.5:1 minimum contrast ────────────────── */