apps: fc-chat refactor + fc-menuboard app split

- fc-chat.yaml: TLS/IngressRoute only (Deployment managed by deploy script, matches fc-signage/fc-mysql/fc-kiosk pattern)
- fc-menuboard: new app bundle

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/fc-menuboard/fc-menuboard.yaml

@@ -0,0 +1,32 @@
+# FlowerCore MenuBoard — TLS + Ingress
+# Deployment and Service managed by deploy script (not ArgoCD)
+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: menuboard-web-tls
+  namespace: fc-menuboard
+spec:
+  secretName: menuboard-web-tls
+  issuerRef:
+    name: step-ca-acme
+    kind: ClusterIssuer
+  dnsNames:
+    - menuboard.iamworkin.lan
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: menuboard-web
+  namespace: fc-menuboard
+spec:
+  entryPoints:
+    - websecure
+  routes:
+    - match: Host(`menuboard.iamworkin.lan`)
+      kind: Rule
+      services:
+        - name: menuboard-web
+          port: 80
+  tls:
+    secretName: menuboard-web-tls