feat(sdk): API-Referenz Frontend + Backend-Konsolidierung (Shared Utilities, CRUD Factory)

- API-Referenz Seite (/sdk/api-docs) mit ~690 Endpoints, Suche, Filter, Modul-Index
- Shared db_utils.py (row_to_dict) + tenant_utils Integration in 6 Route-Dateien
- CRUD Factory (crud_factory.py) fuer zukuenftige Module
- Version-Route Auto-Registration in versioning_utils.py
- 1338 Tests bestanden, -232 Zeilen Duplikat-Code

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

backend-compliance/tests/test_quality_routes.py

@@ -18,10 +18,10 @@ from compliance.api.quality_routes import (
     MetricUpdate,
     TestCreate,
     TestUpdate,
-    _row_to_dict,
-    _get_tenant_id,
-    DEFAULT_TENANT_ID,
 )
+from compliance.api.db_utils import row_to_dict as _row_to_dict
+
+DEFAULT_TENANT_ID = "9282a473-5c95-4b3a-bf78-0ecc0ec71d3e"
 from classroom_engine.database import get_db
 
 # =============================================================================
@@ -283,31 +283,6 @@ class TestRowToDict:
         assert result["count"] == 10
 
 
-# =============================================================================
-# Helper Tests — _get_tenant_id
-# =============================================================================
-
-class TestGetTenantId:
-    def test_valid_uuid_returned(self):
-        result = _get_tenant_id(x_tenant_id=DEFAULT_TENANT)
-        assert result == DEFAULT_TENANT
-
-    def test_none_returns_default(self):
-        result = _get_tenant_id(x_tenant_id=None)
-        assert result == DEFAULT_TENANT_ID
-
-    def test_invalid_uuid_returns_default(self):
-        result = _get_tenant_id(x_tenant_id="invalid-uuid")
-        assert result == DEFAULT_TENANT_ID
-
-    def test_empty_string_returns_default(self):
-        result = _get_tenant_id(x_tenant_id="")
-        assert result == DEFAULT_TENANT_ID
-
-    def test_other_valid_tenant(self):
-        result = _get_tenant_id(x_tenant_id=OTHER_TENANT)
-        assert result == OTHER_TENANT
-
 
 # =============================================================================
 # HTTP Tests — GET /quality/stats
@@ -910,19 +885,12 @@ class TestTenantIsolation:
         resp_b = client.get("/quality/tests", headers={"X-Tenant-Id": OTHER_TENANT})
         assert resp_b.json()["total"] == 0
 
-    def test_invalid_tenant_header_falls_back_to_default(self, mock_db):
-        count_row = MagicMock()
-        count_row.__getitem__ = lambda self, i: 0
-        execute_result = MagicMock()
-        execute_result.fetchone.return_value = count_row
-        execute_result.fetchall.return_value = []
-        mock_db.execute.return_value = execute_result
-
+    def test_invalid_tenant_header_returns_400(self, mock_db):
         response = client.get(
             "/quality/metrics",
             headers={"X-Tenant-Id": "bad-uuid"},
         )
-        assert response.status_code == 200
+        assert response.status_code == 400
 
     def test_delete_wrong_tenant_returns_404(self, mock_db):
         """Deleting a metric that belongs to a different tenant returns 404."""