alerts: Teams webhook fan-out (contract 0.14.0) + printedparts detail revision column

send_webhook(title,text) posts alerts to an optional webhook (Teams Incoming
Webhook / Workflow, or generic JSON) via alert_webhook_url + alert_webhook_format
settings; send_alert fans out to it alongside email; exposed on shopdb.api
(0.13.0->0.14.0, PLUGIN-HOOKS synced); low-stock posts on its custom-recipient
path too. Also: recent-transactions table shows the consumed print-file revision.

tests/test_core/test_webhook_alert.py

@@ -0,0 +1,42 @@
+"""Alert webhook (Teams etc.): payload formats + send_alert fan-out."""
+from unittest.mock import patch
+
+from shopdb.utils.mailer import _webhook_payload, send_webhook, send_alert
+
+CFG = {'url': 'https://teams.example/webhook', 'format': 'teams'}
+
+
+def test_payload_formats():
+    teams = _webhook_payload('teams', 'Title', 'Body')
+    assert teams['@type'] == 'MessageCard' and teams['title'] == 'Title'
+    card = _webhook_payload('adaptivecard', 'T', 'B')
+    assert card['attachments'][0]['contentType'].endswith('card.adaptive')
+    assert _webhook_payload('json', 'T', 'B') == {'title': 'T', 'text': 'B'}
+
+
+def test_noop_when_unset(app):
+    with app.app_context():
+        with patch('shopdb.utils.mailer.get_webhook_config',
+                   return_value={'url': '', 'format': 'teams'}):
+            ok, err = send_webhook('t', 'b')
+            assert ok is False and err is None
+
+
+def test_posts_when_configured(app):
+    with app.app_context():
+        with patch('shopdb.utils.mailer.get_webhook_config', return_value=CFG), \
+             patch('shopdb.utils.mailer.requests') as mock_requests:
+            mock_requests.post.return_value.status_code = 200
+            ok, err = send_webhook('Low stock', 'x down')
+            assert ok is True and err is None
+            assert mock_requests.post.call_args[0][0] == CFG['url']
+            assert mock_requests.post.call_args[1]['json']['@type'] == 'MessageCard'
+
+
+def test_send_alert_fans_out_to_webhook(app):
+    with app.app_context():
+        with patch('shopdb.utils.mailer.get_webhook_config', return_value=CFG), \
+             patch('shopdb.utils.mailer.requests') as mock_requests:
+            mock_requests.post.return_value.status_code = 200
+            send_alert('Subject', '<p>Body</p>')
+            assert mock_requests.post.called  # webhook fired even with no email recipients