feat: VPN toggle (#689)

* feat: configurable VPN toggle for Wireguard

- Added VPN service for wg-quick
- Added VPN toggle to utilities quick toggles
- Configuration in UtilitiesConfig (enabled, connectionName)

* fix:  monitoring and toasts

- Using nmcli monitor for state detection instead of polling
- Added VPN toast notifications

* fix: use polkit

* feat: multi-provider VPN support

- Added support for netbird and tailscale providers
- Universal interface detection using ip link show
- Provider-specific privilege handling (pkexec only for wireguard)
- Updated README with VPN configuration examples

* feat: less hardcoded, configurable providers

* removed comments

* code style changes

* reorganize signal handler

1 files changed, 7 insertions, 0 deletions

diff --git a/config/UtilitiesConfig.qml b/config/UtilitiesConfig.qml
index 3094efa..0c48034 100644
--- a/config/UtilitiesConfig.qml
+++ b/config/UtilitiesConfig.qml
@@ -6,6 +6,7 @@ JsonObject {
 
     property Sizes sizes: Sizes {}
     property Toasts toasts: Toasts {}
+    property Vpn vpn: Vpn {}
 
     component Sizes: JsonObject {
         property int width: 430
@@ -22,5 +23,11 @@ JsonObject {
         property bool capsLockChanged: true
         property bool numLockChanged: true
         property bool kbLayoutChanged: true
+        property bool vpnChanged: true
+    }
+
+    component Vpn: JsonObject {
+        property bool enabled: false
+        property list<var> provider: ["netbird"]
     }
 }