Phase 12: Test-Suite (30 pytest-Tests) + CLAUDE.md aktualisiert

tests/:
  conftest.py        - minimale Env-Vars + sys.path-Setup
  test_auth.py       - Magic-Token + JWT Round-Trip (4 Tests)
  test_audit.py      - diff() + _to_json() Helper (8 Tests)
  test_models.py     - Pydantic-Validierung (7 Tests)
  test_source_meta.py - Single Source of Truth Konsistenz (7 Tests)
  test_imports.py    - alle Backend-Module importierbar (4 Tests)

requirements-dev.txt: pytest, ftfy, pyflakes

Tests sind reine Unit-Tests (kein DB-Zugriff, kein HTTP-Server),
laufen in <0.5s, geben sofortiges Catch-Net fuer Syntax/Import-Bugs.

Aufruf: PYTHONPATH=src ./venv/bin/python -m pytest tests/ -v

CLAUDE.md erweitert um:
- Sektion Tests (Framework, Pfad, Ausfuehrung)
- Sektion Phasen-Historie (alle 12 Phasen der Aufraeum-Aktion 2026-05-09
  mit kurzer Erklaerung)

tests/test_models.py

@@ -0,0 +1,53 @@
+"""Tests fuer src/models.py - Pydantic-Validierung."""
+import pytest
+from pydantic import ValidationError
+from models import (
+    MagicLinkRequest, MagicLinkResponse,
+    VerifyTokenRequest, TokenResponse,
+    OrgCreate, LicenseCreate, UserCreate,
+)
+
+
+def test_magic_link_request_accepts_email():
+    r = MagicLinkRequest(email="info@aegis-sight.de")
+    assert r.email == "info@aegis-sight.de"
+
+
+def test_magic_link_request_rejects_too_short():
+    with pytest.raises(ValidationError):
+        MagicLinkRequest(email="a")
+
+
+def test_verify_token_min_length():
+    with pytest.raises(ValidationError):
+        VerifyTokenRequest(token="abc")
+
+
+def test_token_response_default_email_empty():
+    r = TokenResponse(access_token="x" * 40, username="info")
+    assert r.email == ""
+    assert r.token_type == "bearer"
+
+
+def test_org_create_slug_pattern():
+    """Slug muss lowercase mit Bindestrichen sein."""
+    OrgCreate(name="Test", slug="abc-123")
+    with pytest.raises(ValidationError):
+        OrgCreate(name="Test", slug="Wrong Case")
+    with pytest.raises(ValidationError):
+        OrgCreate(name="Test", slug="under_score")
+
+
+def test_license_create_type_pattern():
+    LicenseCreate(organization_id=1, license_type="trial")
+    LicenseCreate(organization_id=1, license_type="annual")
+    LicenseCreate(organization_id=1, license_type="permanent")
+    with pytest.raises(ValidationError):
+        LicenseCreate(organization_id=1, license_type="lifetime")
+
+
+def test_user_create_role_pattern():
+    UserCreate(email="a@b.de", role="member")
+    UserCreate(email="a@b.de", role="org_admin")
+    with pytest.raises(ValidationError):
+        UserCreate(email="a@b.de", role="superuser")