Add a preference option to disable hardware audio offloading (#1564)

## Description
By default, Wholphin plays music with hardware audio offloading enabled.
This delegates audio decoding to the device's hardware DSP, making
playback stability highly dependent on the manufacturer's system audio
implementation. On certain hardware (such as my TCL TVs, e.g., the
Chinese Model Q9L Pro), this implementation causes music playback to
hang indefinitely at 0 seconds.

### Related issues
#1372

### Testing
Tested on a TCL TV (Q9L Pro):
- Some musics playback hangs at 0s with offloading enabled.
- Disabling audio offloading fixes the issues for all medias.

## Screenshots
<!-- Please include screenshots if the PR alters any UI elements -->
<img width="4284" height="5712" alt="IMG_9486"
src="https://github.com/user-attachments/assets/ddf95e68-6ebd-42f9-9565-568de4fbfc42"
/>

## AI or LLM usage
Developed in pair with Gemini and human-reviewed, tested.

---------

Co-authored-by: Damontecres <damontecres@gmail.com>

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreferencesSerializer.kt

@@ -182,6 +182,8 @@ class AppPreferencesSerializer
                             .apply {
                                 enabled = false
                                 videoTunnelingEnabled = false
+                                preferAc3Surround = ExperimentalPreference.PreferAc3ForSurround.defaultValue
+                                disableAudioOffload = ExperimentalPreference.DisableAudioOffload.defaultValue
                             }.build()
                 }.build()
 

app/src/main/java/com/github/damontecres/wholphin/preferences/ExperimentalPreference.kt

@@ -60,6 +60,17 @@ object ExperimentalPreference {
                 }
             },
         )
+
+    val DisableAudioOffload =
+        AppSwitchPreference<AppPreferences>(
+            title = R.string.disable_audio_offload,
+            defaultValue = false,
+            getter = { it.experimentalPreferences.disableAudioOffload },
+            setter = { prefs, value ->
+                prefs.updateExperimentalPreferences { disableAudioOffload = value }
+            },
+            summary = R.string.disable_audio_offload_summary,
+        )
 }
 
 val experimentalPreferences =
@@ -71,6 +82,7 @@ val experimentalPreferences =
                     listOf(
                         ExperimentalPreference.VideoTunneling,
                         ExperimentalPreference.PreferAc3ForSurround,
+                        ExperimentalPreference.DisableAudioOffload,
                     ),
             ),
         )