fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/tests/test_email_service.py

@@ -0,0 +1,190 @@
+"""
+Tests fuer den Email-Service.
+
+Testet:
+- EmailService Klasse
+- SMTP Verbindung (mit Mock)
+- Messenger-Benachrichtigungen
+- Jitsi-Einladungen
+"""
+
+import pytest
+from unittest.mock import patch, MagicMock
+
+from email_service import EmailService, EmailResult
+
+
+class TestEmailService:
+    """Tests fuer die EmailService Klasse."""
+
+    def test_init_default_values(self):
+        """Test: Service wird mit Default-Werten initialisiert."""
+        service = EmailService()
+
+        # Default ist 'mailpit' in Docker, 'localhost' lokal - beides akzeptieren
+        assert service.host in ("localhost", "mailpit")
+        assert service.port == 1025
+        # from_name kann "BreakPilot" oder "BreakPilot Dev" sein (dev environment)
+        assert service.from_name in ("BreakPilot", "BreakPilot Dev")
+        assert service.from_addr == "noreply@breakpilot.app"
+
+    def test_init_custom_values(self):
+        """Test: Service wird mit benutzerdefinierten Werten initialisiert."""
+        service = EmailService(
+            host="smtp.example.com",
+            port=587,
+            username="user",
+            password="pass",
+            from_name="Custom",
+            from_addr="custom@example.com",
+            use_tls=True
+        )
+
+        assert service.host == "smtp.example.com"
+        assert service.port == 587
+        assert service.username == "user"
+        assert service.password == "pass"
+        assert service.from_name == "Custom"
+        assert service.from_addr == "custom@example.com"
+        assert service.use_tls is True
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_email_success(self, mock_smtp):
+        """Test: Email wird erfolgreich gesendet."""
+        mock_instance = MagicMock()
+        mock_smtp.return_value.__enter__ = MagicMock(return_value=mock_instance)
+        mock_smtp.return_value.__exit__ = MagicMock(return_value=False)
+
+        service = EmailService()
+        result = service.send_email(
+            to_email="test@example.com",
+            subject="Test",
+            body_text="Test Body"
+        )
+
+        assert result.success is True
+        assert result.recipient == "test@example.com"
+        assert result.sent_at is not None
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_email_with_html(self, mock_smtp):
+        """Test: Email mit HTML wird gesendet."""
+        mock_instance = MagicMock()
+        mock_smtp.return_value.__enter__ = MagicMock(return_value=mock_instance)
+        mock_smtp.return_value.__exit__ = MagicMock(return_value=False)
+
+        service = EmailService()
+        result = service.send_email(
+            to_email="test@example.com",
+            subject="Test",
+            body_text="Plain text",
+            body_html="<h1>HTML</h1>"
+        )
+
+        assert result.success is True
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_email_failure(self, mock_smtp):
+        """Test: Fehler beim Email-Versand wird behandelt."""
+        import smtplib
+        mock_smtp.side_effect = smtplib.SMTPException("Connection failed")
+
+        service = EmailService()
+        result = service.send_email(
+            to_email="test@example.com",
+            subject="Test",
+            body_text="Test Body"
+        )
+
+        assert result.success is False
+        assert result.error is not None
+        assert "SMTP" in result.error
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_messenger_notification(self, mock_smtp):
+        """Test: Messenger-Benachrichtigung wird gesendet."""
+        mock_instance = MagicMock()
+        mock_smtp.return_value.__enter__ = MagicMock(return_value=mock_instance)
+        mock_smtp.return_value.__exit__ = MagicMock(return_value=False)
+
+        service = EmailService()
+        result = service.send_messenger_notification(
+            to_email="parent@example.com",
+            to_name="Max Mustermann",
+            sender_name="Frau Lehrerin",
+            message_content="Bitte bringen Sie morgen das Buch mit."
+        )
+
+        assert result.success is True
+        assert result.recipient == "parent@example.com"
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_jitsi_invitation(self, mock_smtp):
+        """Test: Jitsi-Einladung wird gesendet."""
+        mock_instance = MagicMock()
+        mock_smtp.return_value.__enter__ = MagicMock(return_value=mock_instance)
+        mock_smtp.return_value.__exit__ = MagicMock(return_value=False)
+
+        service = EmailService()
+        result = service.send_jitsi_invitation(
+            to_email="parent@example.com",
+            to_name="Max Mustermann",
+            organizer_name="Frau Lehrerin",
+            meeting_title="Elterngespraech",
+            meeting_date="20. Dezember 2024",
+            meeting_time="14:00 Uhr",
+            jitsi_url="https://meet.jit.si/BreakPilot-test123"
+        )
+
+        assert result.success is True
+        assert result.recipient == "parent@example.com"
+
+    @patch('email_service.smtplib.SMTP')
+    def test_send_jitsi_invitation_with_additional_info(self, mock_smtp):
+        """Test: Jitsi-Einladung mit zusaetzlichen Infos wird gesendet."""
+        mock_instance = MagicMock()
+        mock_smtp.return_value.__enter__ = MagicMock(return_value=mock_instance)
+        mock_smtp.return_value.__exit__ = MagicMock(return_value=False)
+
+        service = EmailService()
+        result = service.send_jitsi_invitation(
+            to_email="parent@example.com",
+            to_name="Max Mustermann",
+            organizer_name="Frau Lehrerin",
+            meeting_title="Elterngespraech",
+            meeting_date="20. Dezember 2024",
+            meeting_time="14:00 Uhr",
+            jitsi_url="https://meet.jit.si/BreakPilot-test123",
+            additional_info="Bitte bereiten Sie die Zeugnismappe vor."
+        )
+
+        assert result.success is True
+
+
+class TestEmailResult:
+    """Tests fuer das EmailResult Dataclass."""
+
+    def test_success_result(self):
+        """Test: Erfolgreiche Email-Antwort."""
+        result = EmailResult(
+            success=True,
+            message_id="msg-123",
+            recipient="test@example.com",
+            sent_at="2024-12-18T10:00:00"
+        )
+
+        assert result.success is True
+        assert result.message_id == "msg-123"
+        assert result.error is None
+
+    def test_failure_result(self):
+        """Test: Fehlgeschlagene Email-Antwort."""
+        result = EmailResult(
+            success=False,
+            error="Connection refused",
+            recipient="test@example.com"
+        )
+
+        assert result.success is False
+        assert result.error == "Connection refused"
+        assert result.sent_at is None