✨ feat(email): pkg/email + Mailpit docker-compose service (ADR-0029 Phase A.1) (#59)

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

docker-compose.yml

@@ -19,6 +19,23 @@ services:
       - dance-lessons-coach-network
     restart: unless-stopped
 
+  # Mailpit — local SMTP capture for dev + BDD parallel email tests.
+  # Cf. ADR-0029 (email infrastructure) and ADR-0030 (BDD parallel strategy).
+  # SMTP submission on :1025 (used by the app), HTTP UI + API on :8025
+  # (used by tests + manual inspection at http://localhost:8025).
+  mailpit:
+    image: axllent/mailpit:latest
+    container_name: dance-lessons-coach-mailpit
+    ports:
+      - "1025:1025"  # SMTP submission
+      - "8025:8025"  # HTTP UI / API
+    environment:
+      MP_MAX_MESSAGES: 5000
+      MP_SMTP_AUTH_ALLOW_INSECURE: 1  # local dev only - no TLS, no real auth
+    networks:
+      - dance-lessons-coach-network
+    restart: unless-stopped
+
   # Application service (for reference)
   # app:
   #   build: .