feat(html): reorganize import paths by use case

[mihar-22]

Closes #474

Summary

Restructure @videojs/html subpath exports from <thing>/<use-case> to <use-case>/<thing>, so imports read as natural noun phrases (e.g., @videojs/html/video/player instead of @videojs/html/player/video).

Changes

• Restructure define/ directory: player/video.ts → video/player.ts, skin/video.ts → video/skin.ts
• Add AudioPlayerElement (<audio-player>) and BackgroundVideoPlayerElement (<background-video-player>) definitions
• Add BackgroundFeatures type (empty with TODO) and features.background bundle in core
• Define elements now extend PlayerElement with static readonly tagName
• Replace ./player/* and ./skin/* package.json exports with ./video/*, ./audio/*, ./background/*
• Update all RFC docs, site code, and implementation plans with new import paths

Implementation details

• BackgroundFeatures is an empty tuple ([]) with a TODO — features to be defined later
• No createPlayer overload for background since the feature set is empty and would surface in autocomplete
• feature/*, media/*, and ui/* exports are unchanged — they aren't use-case-specific
• Build config (tsdown.config.ts) auto-discovers via glob so no changes needed

Testing

pnpm -F @videojs/html test   # 5 tests pass (2 new for audio + background)
pnpm typecheck                # clean
pnpm build:packages           # all packages build
pnpm test                     # full suite passes (748 tests)

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[mihar-22]

@decepulis

[mihar-22]

See #474