update

doc/core-apps/mail/features.md

@@ -0,0 +1,6 @@
+- mail
+	- MailProvider service registered via DI; SMTP implementation (Mailhog in dev, real SMTP in prod)
+	- Jinja2 templates with DE/EN i18n
+	- no public routes — used by other apps (e.g. orders) through DI
+	- depends on: core
+	- room for growth: outbound queue with retries, provider abstraction (SendGrid, Postmark, SES), richer transactional templates, bounce/complaint handling

doc/core-apps/mail/specs.md

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+- __init__.py (on_load, MailProvider, SMTP implementation)
+- manifest.yaml