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>

docs/GETTING-STARTED.md

@@ -20,10 +20,10 @@ docker compose down -v
 
 ## First Boot
 
-On first start, Switchboard Core will:
+On first start, Armature will:
 
 1. Run database migrations (SQLite by default in compose).
-2. Create the admin user from `SWITCHBOARD_ADMIN_USERNAME` / `SWITCHBOARD_ADMIN_PASSWORD` env vars.
+2. Create the admin user from `ARMATURE_ADMIN_USERNAME` / `ARMATURE_ADMIN_PASSWORD` env vars.
 3. Auto-install the curated default package set (notes, chat-core, dashboard, workflow demos, etc.).
 
 No manual setup steps are required.
@@ -67,8 +67,8 @@ You can also upload `.pkg` archives through the Admin > Packages page.
 | `AUTH_MODE` | `builtin` | `builtin`, `mtls`, or `oidc` |
 | `STORAGE_BACKEND` | auto | `pvc` or `s3` |
 | `STORAGE_PATH` | `/data/storage` | PVC mount point |
-| `SWITCHBOARD_ADMIN_USERNAME` | | Bootstrap admin username |
-| `SWITCHBOARD_ADMIN_PASSWORD` | | Bootstrap admin password |
+| `ARMATURE_ADMIN_USERNAME` | | Bootstrap admin username |
+| `ARMATURE_ADMIN_PASSWORD` | | Bootstrap admin password |
 | `BUNDLED_PACKAGES` | (empty) | `""` = curated defaults, `"*"` = all, or comma-separated IDs |
 | `SKIP_BUNDLED_PACKAGES` | `false` | Disable auto-install entirely |
 | `LOG_LEVEL` | `info` | `debug`, `info`, `warn`, `error` |
@@ -77,7 +77,7 @@ You can also upload `.pkg` archives through the Admin > Packages page.
 ## From Source
 
 ```bash
-git clone <repo-url> && cd switchboard-core
+git clone <repo-url> && cd armature
 cp server/.env.example server/.env   # edit DB credentials
 cd server && go run .
 # Backend on http://localhost:8080