fix: disable souvlaki on Windows to fix startup crash (v1.17.1)

SMTC init via souvlaki requires a valid HWND + COM message loop, which
are not available in setup(). Guarded behind #[cfg(not(target_os = "windows"))].
mpris_set_metadata / mpris_set_playback no-op on Windows via the None branch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "psysonic",
-  "version": "1.17.0",
+  "version": "1.17.1",
   "private": true,
   "scripts": {
     "dev": "vite",