refactor(msg_gateway): restructure and rename message_gateway aligned with custom_example

backend/plugins/domain/msg_gateway/push/telegram_test.go

@@ -0,0 +1,28 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package push
+
+import (
+	"context"
+	"testing"
+)
+
+func TestTelegramPusherValidation(t *testing.T) {
+	pusher := &TelegramPusher{}
+
+	err := pusher.ValidateConfig(Config{Secret: "123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11"})
+	if err != nil {
+		t.Errorf("ValidateConfig failed: %v", err)
+	}
+
+	err = pusher.ValidateConfig(Config{})
+	if err == nil {
+		t.Errorf("expected error for empty config, got nil")
+	}
+
+	_, err = pusher.Send(context.Background(), Config{Secret: "123:token"}, "not-a-number", map[string]any{"title": "test"}, "", nil)
+	if err == nil {
+		t.Errorf("expected error for invalid chat_id, got nil")
+	}
+}