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_email_templates.py

@@ -0,0 +1,40 @@
+from datetime import datetime
+
+from web.email_templates import render_job_alert_email
+
+
+def test_render_job_alert_email_with_jobs():
+    jobs = [
+        {
+            "title": "Python Developer",
+            "company": "Acme",
+            "location": "Remote",
+            "url": "https://example.com/jobs/1",
+        },
+        {
+            "title": "Data Engineer",
+            "company": "Globex",
+            "location": "NYC",
+            "url": "https://example.com/jobs/2",
+        },
+    ]
+    ts = datetime(2025, 11, 3, 12, 0)
+    rendered = render_job_alert_email(
+        jobs, region="sfbay", keyword="python", generated_at=ts)
+
+    assert rendered["subject"] == "2 new jobs (region: sfbay, keyword: python)"
+    assert "1. Python Developer" in rendered["body"]
+    assert "Generated at 2025-11-03 12:00 UTC." in rendered["body"]
+    assert rendered["context"]["count"] == 2
+    assert rendered["context"]["jobs_section"].startswith(
+        "\n1. Python Developer")
+
+
+def test_render_job_alert_email_empty():
+    ts = datetime(2025, 11, 3, 12, 0)
+    rendered = render_job_alert_email([], generated_at=ts)
+
+    assert rendered["subject"] == "No new jobs"
+    assert "No jobs matched this alert." in rendered["body"]
+    assert rendered["body"].count("Generated at") == 1
+    assert rendered["context"]["count"] == 0