feat: Implement email sending utilities and templates for job notifications

- Added email_service.py for sending emails with SMTP configuration.
- Introduced email_templates.py to render job alert email subjects and bodies.
- Enhanced scraper.py to extract contact information from job listings.
- Updated settings.js to handle negative keyword input validation.
- Created email.html and email_templates.html for managing email subscriptions and templates in the admin interface.
- Modified base.html to include links for email alerts and templates.
- Expanded user settings.html to allow management of negative keywords.
- Updated utils.py to include functions for retrieving negative keywords and email settings.
- Enhanced job filtering logic to exclude jobs containing negative keywords.

tests/test_utils_config.py

@@ -16,3 +16,23 @@ def test_http_settings_helpers():
     assert isinstance(utils.get_backoff_factor(), int)
     assert isinstance(utils.get_min_delay(), int)
     assert isinstance(utils.get_max_delay(), int)
+
+
+def test_negative_keywords_helper():
+    keywords = utils.get_negative_keywords()
+    assert isinstance(keywords, list)
+    for kw in keywords:
+        assert isinstance(kw, str)
+        assert kw == kw.lower()
+
+
+def test_email_settings_helper():
+    settings = utils.get_email_settings()
+    assert isinstance(settings, dict)
+    assert 'enabled' in settings
+    assert 'from_address' in settings
+    smtp = settings.get('smtp')
+    assert isinstance(smtp, dict)
+    assert 'host' in smtp
+    assert isinstance(smtp.get('port'), int)
+    assert isinstance(settings.get('recipients'), list)