fix(mail): change FROM address to hi@pivoine.art for IONOS relay compatibility

IONOS rejects relay from VPS IPs when sender doesn't match authenticated
account. Switch gitea and passbolt FROM to the actual IONOS account address.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gitea/.env.example

@@ -1,5 +1,5 @@
 TRAEFIK_HOST=dev.example.com
 NETWORK_NAME=falcon_network
 RUNNER_TOKEN=change_me
-EMAIL_FROM=gitea@pivoine.art
+EMAIL_FROM=hi@pivoine.art
 EMAIL_USER=Gitea