Add optional Yandex voice-over translation (EN to RU) for player

[mikhkz]

Summary

Adds an optional Yandex Voice-Over Translation (VOT) feature for Android TV: translate the current YouTube video's audio to Russian while watching (similar to the browser extension workflow).

• Player overlay button: Voice translation (RU) with OFF / waiting / ON states
• Second ExoPlayer for the translated MP3 stream, synced with main playback (play/pause/seek, speed)
• Mix controls: original + translation volume (settings + long-press on the button)
• Auto-translate for non-Russian audio (skips Russian originals and YouTube ru (dubbed-auto))
• Optional YouTube auto-dub track instead of Yandex when available
• VotAudioTrackHelper parses YouTube audio labels (en-US (original), legacy bare [en], etc.)
• Settings: Player -> Voice translation (Yandex) - OAuth token (lively voice), auto-translate, volumes
• Handles AUDIO_REQUESTED via the same fallback as vot.js (fail-audio-js + empty audio upload)

Prior work (this port is based on)

Implementation ideas and API behavior are derived from the community Voice Over Translation projects:

• ilyhalight/voice-over-translation - browser extension (original UX reference)
• FOSWLY/vot-cli - CLI / protobuf client patterns
• FOSWLY/vot.js - AUDIO_REQUESTED / fail-audio-js workaround

Thank you to the authors and contributors of those repositories. This PR adds a TV-native integration for SmartTube; it is not affiliated with Yandex or the extension authors.

Motivation

Many SmartTube users watch English content on TV without a desktop browser. A built-in VOT toggle improves accessibility and matches a popular browser extension use case.

Implementation notes

• Package common/.../vot/ - protobuf client for api.browser.yandex.ru (OkHttp), ported from vot-cli / voice-over-translation ideas
• VoiceTranslateController - UI state, auto-translate, track selection, VotClient + TranslationAudioPlayer
• ActionHelpers.getBitmapDrawable() - vector drawable support in TwoStateAction (fixes ClassCastException for overlay actions)
• Button is off by default; enable in Configure player buttons

How to test

1. Build assembleStstableDebug
2. Open an English YouTube video (including legacy single [en] audio tracks)
3. Enable Voice translation in player button settings if hidden
4. Tap the button - wait for ETA - hear RU voice-over with ducked original
5. Long-press - auto-translate / YouTube dub / volume mix
6. Open a Russian original video - auto-translate should not start; manual shows skip message
7. (Optional) Set Yandex OAuth token for lively voice

Limitations / risks

• Unofficial Yandex API - may break or rate-limit without notice
• New videos may take a long time (AUDIO_REQUESTED uses fallback, not full YouTube audio upload)
• Video length API limits (~4 hours)
• Ducking is main player volume multiplier, not DSP sidechain
• OAuth token stored locally in app prefs (user-provided)

Checklist

• Builds with assembleStstableDebug
• Feature is opt-in (button + settings)
• No new product flavors / package id changes in this PR
• Strings in values and values-ru