feat: add live SABR and embedded playback

[Priveetee]

Summary

• add the standalone YouTube embed player with start-time aliases and recovery states
• use native SABR for YouTube video and livestream playback
• keep live playback stable across session transitions and transient stalls
• add one-click Watch Later actions to video menus
• show members-only and unavailable states directly on thumbnails
• preserve imported playlist ordering and removal behavior
• update the frontend version to 1.1.0

Contributors

Big thx to @tam1m for the embedded player in #2!

Runtime verification

• deployed commit 276afb55825ca1e570b3cc45a36c74d7deff6c80 on the beta instance
• validated image ghcr.io/typetype-video/typetype-beta@sha256:d14608871589ade6084bb8e080281f2b364a2ad90bac16667a721c30af01acd5
• validated live playback in Chromium, Firefox and WebKit on the watch page and embed
• observed a continuous live session for about 22 minutes without a playback failure
• validated Watch Later and the supplied YouTube Takeout archive through the beta UI contracts
• WebKit mobile playback passed; installed iOS PWA behavior still needs physical-device verification for [Bug]: Works perfectly in PC, not loading any video in Safari iOS TypeType#161
• live quality and codec switching remains tracked separately in [Bug]: Live playback freezes after changing quality or codec TypeType#163 and does not block 1.1.0

Tests

• bun run check
• bun run test:coverage
• bun run build
• bun run knip
• bun run sherif
• git diff --check
• Coverage and Docker workflows