fix(tvos): make EAC3 playback conform to Dolby's guidance

Groundwork for #1300. Establishes the session, buffering and route
handling Dolby's application guide prescribes, and adds the diagnostic
arm needed to find out whether Apple's sample-buffer renderer can carry
Atmos objects at all.

Audio session, per the guide's sequence:

- Adopt the long-form playback profile in one atomic call at app launch
  and activate the session there. The SDK only accepts that policy with
  category Playback, a Default/MoviePlayback/SpokenAudio mode and no
  options, so it cannot be assembled from separate calls.
- Report the resolved rendering mode in the player, hidden unless the
  system resolves it. Apple only resolves it for CarPlay and AirPlay, so
  an unresolved value means unknown, never "not Dolby".

Diagnostics (Apple TV only, Settings > Video Playback > Atmos Output Test):

- Add a sample-buffer arm. It reads the asset with AVAssetReader at
  outputSettings nil and hands the untouched compressed buffers and the
  untouched format description straight to the renderer, with a variant
  that rebuilds the description the way playback builds it. Every
  existing mode went through AVPlayer, so nothing exercised the path
  playback actually uses; this is what tells us whether the renderer or
  our construction is at fault.
- Add an AirPlay route picker. AirPlay is the only route where the system
  resolves the rendering mode and the supported channel layouts, so it is
  what makes those observations reachable at all, and the AVPlayer arms
  now allow external playback so every arm can be compared on the same
  destination.
- Add a session-mode toggle for the one profile difference between the
  guide and previous playback behaviour.
- Report the session profile, supported layouts, both format
  descriptions, the magic cookie and the renderer status, and release the
  session on stop so a failed run cannot contaminate the next one.

Also bumps MPVKit to 1.0.14, which carries the matching audio output
work: the channel layout AVFoundation itself uses for Dolby content, a
renderer-failure observer so the fallback to PCM can actually run, the
prescribed feed ordering and preroll, flush recovery that re-supplies the
discarded audio instead of shifting later audio into its place, and
capability-driven fallback on route and capability changes.

This does not yet fix #1300. Whether the sample-buffer renderer can carry
JOC is still unknown; it removes every difference from the documented
setup that could explain the failure, and gives us the arm to answer it
on real hardware.

lib/i18n/ko.i18n.json

@@ -289,6 +289,15 @@
     "atmosTestRawStreamDescription": "플레이어 내 Atmos 재생과 동일한 방식으로 테스트 파일을 스트리밍합니다. 테스트 파일 URL이 필요합니다.",
     "atmosTestRawFile": "원시 EAC3 파일",
     "atmosTestRawFileDescription": "길이가 알려진 테스트 파일을 재생합니다. 테스트 파일 URL이 필요합니다.",
+    "atmosTestAsbarNative": "샘플 버퍼 렌더러(네이티브)",
+    "atmosTestAsbarNativeDescription": "파일의 압축 오디오를 그대로 시스템 렌더러에 전달합니다. 테스트 파일 URL이 필요합니다.",
+    "atmosTestAsbarGenerated": "샘플 버퍼 렌더러(재구성)",
+    "atmosTestAsbarGeneratedDescription": "동일하지만 오디오 설명을 재생과 같은 방식으로 재구성합니다. 테스트 파일 URL이 필요합니다.",
+    "atmosTestSessionMode": "동영상 재생 세션 모드 사용",
+    "atmosTestSessionModeDescription": "끄면 Dolby가 문서화한 모드를 사용합니다. 켜면 이전 모드를 사용합니다.",
+    "atmosTestShowRoutePicker": "AirPlay 출력 선택",
+    "atmosTestHideRoutePicker": "AirPlay 출력 선택기 숨기기",
+    "atmosTestRoutePickerDescription": "테스트를 AirPlay 수신기로 보냅니다. 확인된 오디오 모드는 AirPlay에서만 보고됩니다.",
     "atmosTestStop": "테스트 중지",
     "atmosTestUrl": "테스트 파일 URL",
     "atmosTestUrlDescription": "원시 .ec3 Dolby Atmos 파일의 HTTP URL(예: ffmpeg로 추출)",
@@ -1344,6 +1353,11 @@
     "audioOutput": "오디오 출력",
     "performanceOverlay": "성능 오버레이",
     "audioPassthrough": "오디오 패스스루",
+    "audioOutputDolbyAtmos": "Dolby Atmos",
+    "audioOutputDolbyAudio": "Dolby Audio",
+    "audioOutputSurround": "서라운드",
+    "audioOutputSpatial": "공간 음향",
+    "audioOutputStereo": "스테레오",
     "audioNormalization": "음량 정규화",
     "audioDownmix": "스테레오로 다운믹스"
   },