[enhancement]: Support disabling MPV entirely

Supports running Feishin solely using web audio (useful for clients with problems with MPV).
Also moves save/restore queue to utils, as MPV object is now optional

src/renderer/router/app-outlet.tsx

@@ -13,8 +13,12 @@ export const AppOutlet = () => {
         const isMpvRequired = () => {
             if (!localSettings) return false;
             const mpvPath = localSettings.get('mpv_path');
-            if (mpvPath) return false;
-            return true;
+            if (mpvPath) {
+                return false;
+            }
+
+            const mpvDisabled = localSettings.get('disable_mpv');
+            return !mpvDisabled;
         };
 
         const isServerRequired = !currentServer;