Update backend/internal/service/gateway_request_test.go

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

backend/internal/service/gateway_request_test.go

@@ -584,12 +584,15 @@ func TestFilterSignatureSensitiveBlocksForRetry_RemovesClearThinkingStrategy(t *
 
 	cm, ok := req["context_management"].(map[string]any)
 	require.True(t, ok)
-	edits, _ := cm["edits"].([]any)
+	if rawEdits, hasEdits := cm["edits"]; hasEdits {
+		edits, ok := rawEdits.([]any)
+		require.True(t, ok)
 		for _, e := range edits {
 			em, ok := e.(map[string]any)
 			require.True(t, ok)
 			require.NotEqual(t, "clear_thinking_20251015", em["type"], "clear_thinking_20251015 应被移除")
 		}
+	}
 }
 
 func TestFilterSignatureSensitiveBlocksForRetry_PreservesNonThinkingStrategies(t *testing.T) {