Add an option to check for update without proxy (#10090)

Checking for updates always dialed through the local proxy, which fails
exactly when an update may be needed most - when no working server is
available. Like the subscription-update menu, updating without the proxy
is now possible: the Check Update window gets an "Update via proxy"
toggle (persisted, on by default so existing behavior is unchanged),
honored by the check-only, update and geo-file flows, and by the
scheduled update check.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

v2rayN/ServiceLib/Resx/ResUI.Designer.cs

@@ -4238,6 +4238,15 @@ namespace ServiceLib.Resx {
                 return ResourceManager.GetString("TbSettingsEnableCheckPreReleaseUpdate", resourceCulture);
             }
         }
+
+        /// <summary>
+        ///   查找类似 Update via proxy 的本地化字符串。
+        /// </summary>
+        public static string TbSettingsEnableUpdateViaProxy {
+            get {
+                return ResourceManager.GetString("TbSettingsEnableUpdateViaProxy", resourceCulture);
+            }
+        }
         
         /// <summary>
         ///   查找类似 Enable sorting Configurations by drag-n-drop (requires restart) 的本地化字符串。