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/triggers/webhook.go

@@ -12,7 +12,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"go.starlark.net/starlark"
 
-	"switchboard-core/models"
+	"armature/models"
 )
 
 // HandleWebhook is the Gin handler for inbound webhook triggers.
@@ -51,7 +51,7 @@ func (e *Engine) HandleWebhook(c *gin.Context) {
 
 	// Verify HMAC signature if secret is set
 	if trigger.Secret != "" {
-		sig := c.GetHeader("X-Switchboard-Signature")
+		sig := c.GetHeader("X-Armature-Signature")
 		if !verifyHMAC(body, trigger.Secret, sig) {
 			c.JSON(http.StatusUnauthorized, gin.H{"error": "invalid signature"})
 			return