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>

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Psysonic",
-  "version": "1.17.0",
+  "version": "1.17.1",
   "identifier": "dev.psysonic.player",
   "build": {
     "beforeDevCommand": "npm run dev",