fix(pricing): skip remote scheduler without URL

backend/internal/service/pricing_service.go

@@ -218,6 +218,11 @@ func (s *PricingService) Stop() {
 
 // startUpdateScheduler 启动定时更新调度器
 func (s *PricingService) startUpdateScheduler() {
+	if s == nil || s.cfg == nil || strings.TrimSpace(s.cfg.Pricing.RemoteURL) == "" {
+		logger.LegacyPrintf("service.pricing", "%s", "[Pricing] Remote sync disabled: pricing remote URL is empty")
+		return
+	}
+
 	// 定期检查哈希更新
 	hashInterval := time.Duration(s.cfg.Pricing.HashCheckIntervalMinutes) * time.Minute
 	if hashInterval < time.Minute {

backend/internal/service/pricing_service_test.go

@@ -5,11 +5,42 @@ import (
 	"os"
 	"path/filepath"
 	"testing"
+	"time"
 
 	"github.com/Wei-Shaw/sub2api/internal/config"
 	"github.com/stretchr/testify/require"
 )
 
+func TestPricingSchedulerBlankRemoteURLDoesNotStart(t *testing.T) {
+	svc := NewPricingService(&config.Config{Pricing: config.PricingConfig{RemoteURL: "  \t  "}}, nil)
+	defer svc.Stop()
+
+	svc.startUpdateScheduler()
+	done := make(chan struct{})
+	go func() {
+		svc.wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(100 * time.Millisecond):
+		t.Fatal("blank remote URL must not start scheduler")
+	}
+}
+
+func TestPricingNonEmptyInvalidRemoteURLStillReturnsValidationError(t *testing.T) {
+	svc := NewPricingService(&config.Config{Pricing: config.PricingConfig{
+		RemoteURL: "://invalid",
+		DataDir:   t.TempDir(),
+	}}, nil)
+
+	err := svc.ForceUpdate()
+
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "invalid pricing url")
+}
+
 func TestParsePricingData_ParsesPriorityAndServiceTierFields(t *testing.T) {
 	svc := &PricingService{}
 	body := []byte(`{