fix: 修复CSP白屏并优化LDAP配置

backend/internal/service/openvpn/openvpn.go

@@ -28,6 +28,7 @@ import (
 	"gorm.io/gorm"
 
 	"vpn-platform/backend/internal/core"
+	"vpn-platform/backend/internal/ldaputil"
 	"vpn-platform/backend/internal/model"
 	"vpn-platform/backend/internal/service"
 	"vpn-platform/backend/internal/sessionmgr"
@@ -903,11 +904,11 @@ func verifyDialPassword(user *model.VPNUser, password string) error {
 	if err := store.DB.Where("enabled = ?", true).First(&cfg).Error; err != nil {
 		return errors.New("LDAP 未启用")
 	}
-	url := cfg.URL
-	if !strings.HasPrefix(url, "ldap://") && !strings.HasPrefix(url, "ldaps://") {
-		url = "ldap://" + url
+	dialURL, err := ldaputil.DialURL(cfg.URL)
+	if err != nil {
+		return err
 	}
-	conn, err := ldap.DialURL(url)
+	conn, err := ldap.DialURL(dialURL)
 	if err != nil {
 		return err
 	}