feat(audio): add skip_sink_switch option for JACK/DAW routing (#263)

When enabled, skips pactl set-default-sink on stream creation.
Preserves external audio routing (JACK, qjackctl, Reaper).
Mutually exclusive with DAC passthrough.

cc

crates/qbz-player/src/player/mod.rs

@@ -508,6 +508,7 @@ fn try_init_stream_with_backend(
         exclusive_mode: audio_settings.exclusive_mode,
         alsa_plugin: audio_settings.alsa_plugin,
         pw_force_bitperfect: audio_settings.pw_force_bitperfect,
+        skip_sink_switch: audio_settings.skip_sink_switch,
     };
 
     // For ALSA backend with hw: devices, try direct ALSA first (Linux only)