feat(infra): prestage broader app exposure hardening

apps/fc-chat/fc-chat.yaml

@@ -112,6 +112,8 @@ spec:
         app.kubernetes.io/name: chat-web
         app.kubernetes.io/part-of: flowercore
       annotations:
+        fc.flowercore.io/healthz-anon: "true"
+        fc.flowercore.io/probe-path: "/healthz"
         prometheus.io/scrape: "true"
         prometheus.io/port: "8080"
         prometheus.io/path: "/metrics/prometheus"
@@ -128,6 +130,7 @@ spec:
           ports:
             - name: http
               containerPort: 8080
+          # fc-safe-to-expose: X-Forwarded-Proto handled by AddFlowerCoreWebAuth (ADR-178) before any future public/OIDC flip.
           envFrom:
             - configMapRef:
                 name: chat-web-config