Keep email runtime configuration out of Vault

infra/local/notifications/runtime.yml

@@ -19,6 +19,12 @@ messaging:
 templates: "/etc/sxchnge/templates.json"
 callers:
   product: "SXCHNGE_NOTIFICATIONS_PRODUCT_TOKEN"
+email:
+  driver: resend
+  settings:
+    api_key_env: EMAIL_API_KEY
+    sender_address: "" # Set your verified Resend sender here, then run make build.
+    sender_name: "SXCHNGE"
 # Use replicas: 3 and environment: production for a three-node NATS cluster.
 # mode: ops validates resources without modifying them; app provisions them.
 queue: