feat: add system tray icon with Show UI and Exit actions

Adds pystray-based tray icon (green play button) that runs alongside
uvicorn. Double-click opens the web UI in the browser, Exit triggers
graceful shutdown. Disabled with --no-tray flag for headless/service mode.

media_server/main.py

@@ -216,6 +216,11 @@ def main():
         action="store_true",
         help="Show the current API token and exit",
     )
+    parser.add_argument(
+        "--no-tray",
+        action="store_true",
+        help="Disable system tray icon (for headless/service mode)",
+    )
 
     args = parser.parse_args()
 
@@ -235,12 +240,23 @@ def main():
             print("\nAuthentication is DISABLED (no tokens configured)")
         return
 
-    uvicorn.run(
-        "media_server.main:app",
-        host=args.host,
-        port=args.port,
-        reload=False,
-    )
+    # Start system tray icon (unless disabled)
+    tray_icon = None
+    if not args.no_tray:
+        from .tray import start_tray
+
+        tray_icon = start_tray(args.host, args.port)
+
+    try:
+        uvicorn.run(
+            "media_server.main:app",
+            host=args.host,
+            port=args.port,
+            reload=False,
+        )
+    finally:
+        if tray_icon is not None:
+            tray_icon.stop()
 
 
 if __name__ == "__main__":