fix(tests): defer rules import in test_rules.py to avoid CI db init error

backend/tests/test_rules.py

@@ -1,29 +1,31 @@
 from datetime import UTC, datetime
 
-from rules import _matches, evaluate_event
-
 
 def test_matches_equals():
     rule = {"conditions": [{"field": "operation", "op": "eq", "value": "Add user"}]}
     event = {"operation": "Add user", "timestamp": datetime.now(UTC).isoformat()}
+    from rules import _matches
     assert _matches(rule, event) is True
 
 
 def test_matches_not_equals():
     rule = {"conditions": [{"field": "operation", "op": "neq", "value": "Delete user"}]}
     event = {"operation": "Add user", "timestamp": datetime.now(UTC).isoformat()}
+    from rules import _matches
     assert _matches(rule, event) is True
 
 
 def test_matches_contains():
     rule = {"conditions": [{"field": "actor_display", "op": "contains", "value": "Admin"}]}
     event = {"actor_display": "Admin (admin@example.com)", "timestamp": datetime.now(UTC).isoformat()}
+    from rules import _matches
     assert _matches(rule, event) is True
 
 
 def test_matches_after_hours():
     rule = {"conditions": [{"field": "timestamp", "op": "after_hours", "value": None}]}
     event = {"timestamp": "2024-01-01T22:00:00Z"}
+    from rules import _matches
     assert _matches(rule, event) is True
 
     event2 = {"timestamp": "2024-01-01T10:00:00Z"}
@@ -31,7 +33,7 @@ def test_matches_after_hours():
 
 
 def test_evaluate_event_creates_alert(monkeypatch):
-    from rules import alerts_collection
+    from rules import alerts_collection, evaluate_event
 
     monkeypatch.setattr(
         "rules.load_rules",