fix: update 61 outdated test mocks to match current schemas

Tests were failing due to stale mock objects after schema extensions:
- DSFA: add _mapping property to _DictRow, use proper mock instead of MagicMock
- Company Profile: add 6 missing fields (project_id, offering_urls, etc.)
- Legal Templates/Policy: update document type count 52→58
- VVT: add 13 missing attributes to activity mock
- Legal Documents: align consent test assertions with production behavior

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

backend-compliance/tests/test_vvt_tenant_isolation.py

@@ -144,6 +144,20 @@ def _make_activity(tenant_id, vvt_id="VVT-001", name="Test", **kwargs):
     act.next_review_at = None
     act.created_by = "system"
     act.dsfa_id = None
+    # Library refs (added in later migrations)
+    act.purpose_refs = None
+    act.legal_basis_refs = None
+    act.data_subject_refs = None
+    act.data_category_refs = None
+    act.recipient_refs = None
+    act.retention_rule_ref = None
+    act.transfer_mechanism_refs = None
+    act.tom_refs = None
+    act.source_template_id = None
+    act.risk_score = None
+    act.linked_loeschfristen_ids = None
+    act.linked_tom_measure_ids = None
+    act.art30_completeness = None
     act.created_at = datetime.utcnow()
     act.updated_at = datetime.utcnow()
     return act