feat(schedule): remove sourceType from schedule models and payloads

internal/pkg/dto/response/agent_response_test.go

@@ -0,0 +1,27 @@
+package response
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestAgentTeamScheduleResponseOmitsSourceType(t *testing.T) {
+	payload, err := json.Marshal(AgentTeamScheduleResponse{
+		ID:      1,
+		TeamID:  2,
+		StartAt: "2026-04-29 09:00:00",
+		EndAt:   "2026-04-29 18:00:00",
+		Remark:  "test",
+	})
+	if err != nil {
+		t.Fatalf("marshal response error = %v", err)
+	}
+
+	var decoded map[string]any
+	if err := json.Unmarshal(payload, &decoded); err != nil {
+		t.Fatalf("unmarshal response error = %v", err)
+	}
+	if _, ok := decoded["sourceType"]; ok {
+		t.Fatalf("sourceType should not be exposed: %s", payload)
+	}
+}