Add proper email notifications

.env.example

@@ -9,6 +9,11 @@ SECRET_KEY=replace-me-with-a-long-random-string
 DEBUG=true
 ALLOWED_HOSTS=localhost,127.0.0.1
 
+# Public base URL used in outgoing emails (confirmation link, detail-page
+# link). Defaults to http://localhost:8000 if unset. In production set to
+# e.g. https://print.hamlab.lt -- no trailing slash.
+SITE_URL=http://localhost:8000
+
 # --- PostgreSQL ---
 # Used by the `db` container and interpolated into DATABASE_URL inside
 # compose.yaml; the `web` container reads DATABASE_URL via dj-database-url.
@@ -16,15 +21,20 @@ POSTGRES_DB=hamprint
 POSTGRES_USER=hamprint
 POSTGRES_PASSWORD=changeme
 
-# --- Mailjet (transactional email) ---
-# Only used when running with `hamprint.settings.prod`; `hamprint.settings.dev`
-# overrides EMAIL_BACKEND to the console backend so emails are printed to
-# the `web` container logs.
-# Get keys at https://app.mailjet.com/account/apikeys
-MAILJET_API_KEY=
-MAILJET_API_SECRET=
+# --- Mailtrap (transactional email) ---
+# When MAILTRAP_API_TOKEN is set, Django sends through Mailtrap's HTTPS API
+# via django-anymail. When blank, settings/base.py falls back to the console
+# email backend -- handy for local development without burning real quota or
+# spamming real addresses.
+# Get a token at https://mailtrap.io/api-tokens
+MAILTRAP_API_TOKEN=
 DEFAULT_FROM_EMAIL=hamprint <noreply@hamlab.lt>
 
+# Optional: set to a Mailtrap testing-inbox ID to capture outgoing mail in a
+# sandbox inbox instead of actually delivering it. Find the ID in the URL
+# of the inbox at https://mailtrap.io/inboxes. Leave blank for real sending.
+MAILTRAP_TEST_INBOX_ID=
+
 # --- Google OAuth (django-allauth Google provider) ---
 # Configure at https://console.cloud.google.com/apis/credentials and add a
 # SocialApp via Django admin (/admin/socialaccount/socialapp/add/).