i18n(ru/zh-Hans/zh-Hant/hu/fa): translate TUN settings, unify MTU, use resx (#7787)

* feat(i18n,ui): externalize TUN settings labels, add translations

- Replace hard-coded labels "Auto Route", "Strict Route", "Stack",
  and "Mtu/mtu" with resource keys in both Avalonia and WPF views:
  - v2rayN/v2rayN.Desktop/Views/AddServerWindow.axaml
  - v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml
  - v2rayN/v2rayN/Views/AddServerWindow.xaml
  - v2rayN/v2rayN/Views/OptionSettingWindow.xaml
- Add new resource keys in ResUI:
  TbSettingsTunAutoRoute, TbSettingsTunStrictRoute,
  TbSettingsTunStack, TbSettingsTunMtu (unified casing as "MTU").
  Files:
  - v2rayN/ServiceLib/Resx/ResUI.resx
- Provide translations in:
  - v2rayN/ServiceLib/Resx/ResUI.ru.resx
  - v2rayN/ServiceLib/Resx/ResUI.zh-Hans.resx
  - v2rayN/ServiceLib/Resx/ResUI.zh-Hant.resx
  - v2rayN/ServiceLib/Resx/ResUI.fa-Ir.resx
  - v2rayN/ServiceLib/Resx/ResUI.hu.resx
- Normalize XML comments/whitespace in .resx files.
- Update submodule v2rayN/GlobalHotKeys to 5201dd5.

No breaking changes.

* i18n: TUN labels across locales; unify MTU

* chore: ignore local IDE/venv files

* chore(resx): regenerate ResUI.Designer with TUN string accessors

- Add strongly-typed accessors in ServiceLib.Resx.ResUI:
  - TbSettingsTunAutoRoute → "Auto Route"
  - TbSettingsTunStrictRoute → "Strict Route"
  - TbSettingsTunStack → "Stack"
  - TbSettingsTunMtu → "MTU"
- Keep auto-generated structure intact; normalize minor whitespace.

Refs: v2rayN/ServiceLib/Resx/ResUI.resx
No functional changes beyond exposing new i18n keys.

* chore(gitignore): ignore JetBrains Rider artifacts (.idea/, *.sln.iml)

---------

Co-authored-by: Aleksandr Miheichev <alexandr.gmail@tuta.com>

v2rayN/v2rayN.Desktop/Views/OptionSettingWindow.axaml

@@ -736,7 +736,7 @@
                         Grid.Column="0"
                         Margin="{StaticResource Margin4}"
                         VerticalAlignment="Center"
-                        Text="Auto Route" />
+                        Text="{x:Static resx:ResUI.TbSettingsTunAutoRoute}" />
                     <ToggleSwitch
                         x:Name="togAutoRoute"
                         Grid.Row="2"
@@ -749,7 +749,7 @@
                         Grid.Column="0"
                         Margin="{StaticResource Margin4}"
                         VerticalAlignment="Center"
-                        Text="Strict Route" />
+                        Text="{x:Static resx:ResUI.TbSettingsTunStrictRoute}" />
                     <ToggleSwitch
                         x:Name="togStrictRoute"
                         Grid.Row="3"
@@ -762,7 +762,7 @@
                         Grid.Column="0"
                         Margin="{StaticResource Margin4}"
                         VerticalAlignment="Center"
-                        Text="Stack" />
+                        Text="{x:Static resx:ResUI.TbSettingsTunStack}" />
                     <ComboBox
                         x:Name="cmbStack"
                         Grid.Row="4"
@@ -776,7 +776,7 @@
                         Grid.Column="0"
                         Margin="{StaticResource Margin4}"
                         VerticalAlignment="Center"
-                        Text="Mtu" />
+                        Text="{x:Static resx:ResUI.TbSettingsTunMtu}" />
                     <ComboBox
                         x:Name="cmbMtu"
                         Grid.Row="5"