fix(auth): disable trial grants on public email flows

internal/logic/auth/trialEmailWhitelist_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/perfect-panel/server/internal/config"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestNormalizeEmail(t *testing.T) {
@@ -162,6 +163,15 @@ func TestShouldGrantTrialForEmail(t *testing.T) {
 	}
 }
 
+func TestShouldAutoGrantTrialOnPublicEmailFlows(t *testing.T) {
+	assert.False(t, ShouldAutoGrantTrialOnPublicEmailFlows(config.RegisterConfig{}))
+	assert.False(t, ShouldAutoGrantTrialOnPublicEmailFlows(config.RegisterConfig{
+		EnableTrial:               true,
+		EnableTrialEmailWhitelist: true,
+		TrialEmailDomainWhitelist: "gmail.com,example.com",
+	}))
+}
+
 func TestIsEmailDomainWhitelisted(t *testing.T) {
 	whitelist := "gmail.com,edu.cn,outlook.com"
 	tests := []struct {