feat: add Windows service for elevated tunnel operations with IPC communication

Add Windows service to handle WireGuard tunnel operations with elevated privileges. Implement IPC server on TCP port 53189 for client-service communication using JSON protocol. Add install-service and uninstall-service commands to NSIS installer hooks for automatic service installation. Replace direct WireGuard calls with IPC requests when running on Windows. Add TunnelRequest and TunnelResponse types for IPC protocol

desktop-client/src-tauri/tauri.windows.conf.json

@@ -1,6 +1,12 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "bundle": {
-    "targets": ["nsis"]
+    "targets": ["nsis"],
+    "windows": {
+      "nsis": {
+        "installMode": "perMachine",
+        "installerHooks": "./windows/hooks.nsh"
+      }
+    }
   }
 }