feat: Add email settings management and templates functionality

- Implemented email settings configuration in the admin panel, allowing for SMTP settings and notification preferences.
- Created a new template for email settings with fields for SMTP host, port, username, password, sender address, and recipients.
- Added JavaScript functionality to handle loading, saving, and validating email settings.
- Introduced email templates management, enabling the listing, editing, and saving of email templates.
- Updated navigation to include links to email settings and templates.
- Added tests for email settings and templates to ensure proper functionality and validation.

tests/test_contact_service.py

@@ -8,16 +8,16 @@ import pytest
 from server.services import contact as contact_service  # noqa: E402  pylint: disable=wrong-import-position
 
 
-@pytest.fixture
-def patched_settings(monkeypatch):
-    original = contact_service.settings.SMTP_SETTINGS.copy()
-    patched = original.copy()
-    monkeypatch.setattr(contact_service.settings, "SMTP_SETTINGS", patched)
-    return patched
-
-
-def test_send_notification_returns_false_when_unconfigured(monkeypatch, patched_settings):
-    patched_settings.update({"host": None, "recipients": []})
+def test_send_notification_returns_false_when_unconfigured(monkeypatch):
+    monkeypatch.setattr(
+        contact_service,
+        "load_effective_smtp_settings",
+        lambda: {
+            "notify_contact_form": True,
+            "host": None,
+            "recipients": [],
+        },
+    )
 
     # Ensure we do not accidentally open a socket if called
     monkeypatch.setattr(contact_service.smtplib, "SMTP", pytest.fail)
@@ -33,17 +33,22 @@ def test_send_notification_returns_false_when_unconfigured(monkeypatch, patched_
     assert contact_service.send_notification(submission) is False
 
 
-def test_send_notification_sends_email(monkeypatch, patched_settings):
-    patched_settings.update(
-        {
-            "host": "smtp.example.com",
-            "port": 2525,
-            "sender": "sender@example.com",
-            "username": "user",
-            "password": "secret",
-            "use_tls": True,
-            "recipients": ["owner@example.com"],
-        }
+def test_send_notification_sends_email(monkeypatch):
+    smtp_config = {
+        "host": "smtp.example.com",
+        "port": 2525,
+        "sender": "sender@example.com",
+        "username": "user",
+        "password": "secret",
+        "use_tls": True,
+        "recipients": ["owner@example.com"],
+        "notify_contact_form": True,
+    }
+
+    monkeypatch.setattr(
+        contact_service,
+        "load_effective_smtp_settings",
+        lambda: smtp_config,
     )
 
     smtp_calls: dict[str, Any] = {}
@@ -80,13 +85,13 @@ def test_send_notification_sends_email(monkeypatch, patched_settings):
     assert contact_service.send_notification(submission) is True
 
     assert smtp_calls["init"] == (
-        patched_settings["host"],
-        patched_settings["port"],
+        smtp_config["host"],
+        smtp_config["port"],
         15,
     )
     assert smtp_calls["starttls"] is True
     assert smtp_calls["login"] == (
-        patched_settings["username"], patched_settings["password"])
+        smtp_config["username"], smtp_config["password"])
 
     message = cast(EmailMessage, smtp_calls["message"])
     assert message["Subject"] == "Neue Kontaktanfrage von Alice"