feat: externalize EMAIL_FROM and EMAIL_USER to .env for gitea and passbolt

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

passbolt/.env.example

@@ -1,2 +1,4 @@
 TRAEFIK_HOST=passbolt.example.com
 NETWORK_NAME=falcon_network
+EMAIL_FROM=passbolt@pivoine.art
+EMAIL_USER=Passbolt

passbolt/compose.yml

@@ -18,8 +18,8 @@ services:
       EMAIL_TRANSPORT_DEFAULT_HOST: mailpit
       EMAIL_TRANSPORT_DEFAULT_PORT: "1025"
       EMAIL_TRANSPORT_DEFAULT_TLS: "false"
-      EMAIL_DEFAULT_FROM: passbolt@pivoine.art
-      EMAIL_DEFAULT_FROM_NAME: Passbolt
+      EMAIL_DEFAULT_FROM: ${EMAIL_FROM}
+      EMAIL_DEFAULT_FROM_NAME: ${EMAIL_USER}
     volumes:
       - ../.data/passbolt/gpg:/etc/passbolt/gpg
       - ../.data/passbolt/jwt:/etc/passbolt/jwt