feat: add Restart and Shutdown buttons to system tray

Both actions show a confirmation dialog before proceeding.
Restart uses os.execv to re-launch the process in-place.
Shutdown stops the server and exits the tray.

server/src/wled_controller/tray.py

@@ -1,7 +1,10 @@
 """System tray icon for LED Grab (Windows)."""
 
+import os
+import sys
 import webbrowser
 from pathlib import Path
+from tkinter import messagebox
 from typing import Callable
 
 from PIL import Image
@@ -41,7 +44,8 @@ class TrayManager:
         menu = pystray.Menu(
             pystray.MenuItem("Show UI", self._show_ui, default=True),
             pystray.Menu.SEPARATOR,
-            pystray.MenuItem("Exit", self._exit),
+            pystray.MenuItem("Restart", self._restart),
+            pystray.MenuItem("Shutdown", self._shutdown),
         )
 
         self._icon = pystray.Icon(
@@ -56,7 +60,16 @@ class TrayManager:
     def _show_ui(self, icon: "pystray.Icon", item: "pystray.MenuItem") -> None:
         webbrowser.open(f"http://localhost:{self._port}")
 
-    def _exit(self, icon: "pystray.Icon", item: "pystray.MenuItem") -> None:
+    def _restart(self, icon: "pystray.Icon", item: "pystray.MenuItem") -> None:
+        if not messagebox.askyesno("LED Grab", "Restart the server?"):
+            return
+        self._icon.stop()
+        self._on_exit()
+        os.execv(sys.executable, [sys.executable, "-m", "wled_controller"])
+
+    def _shutdown(self, icon: "pystray.Icon", item: "pystray.MenuItem") -> None:
+        if not messagebox.askyesno("LED Grab", "Shut down the server?"):
+            return
         self._on_exit()
         self._icon.stop()