fix(06): CR-07 update test to use event_type prefix instead of full type

The test_audit_log_filter_by_event_type test was passing the full event
type string ("document.uploaded") as the event_type filter parameter.
Update to pass the validated prefix ("document") matching the new
allowlist semantics, and assert item event_type starts with "document."

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

backend/tests/test_audit.py

@@ -131,7 +131,7 @@ async def test_audit_log_filter_by_event_type(async_client, admin_user, db_sessi
 
     response = await async_client.get(
         "/api/admin/audit-log",
-        params={"event_type": "document.uploaded"},
+        params={"event_type": "document"},
         headers=admin_user["headers"],
     )
 
@@ -139,9 +139,9 @@ async def test_audit_log_filter_by_event_type(async_client, admin_user, db_sessi
     body = response.json()
     assert body["total"] >= 1, "expected at least one filtered result"
 
-    # Every returned item must match the filter
+    # Every returned item must match the filter prefix
     for item in body["items"]:
-        assert item["event_type"] == "document.uploaded", (
+        assert item["event_type"].startswith("document."), (
             f"filter returned unexpected event_type: {item['event_type']}"
         )