docs(deploy): add a guide for Apple TV through NativeScript

[chiefcll]

What

Adds Deploying to Apple TV (tvOS) at docs/deploy/appletv.md, linked under Build & Deploy in the sidebar next to Android TV.

Why

tvOS gives third-party apps no browser and no WebView, so the hosted/bundled web app models in the Tizen, webOS and Android TV guides do not apply. SolidTV runs there through NativeScript and @solidtv/nativescript, and the demo app now does so from its own src/, unchanged (solid-demo-app#7). This writes that setup down, following the demo's nativescript/ project.

What the page covers

• How the stack fits together, and why the tvOS bundle uses webpack rather than Vite
• Prerequisites (Xcode 26.4 + tvOS platform, pnpm 10, the xcodeproj gem, the LC_ALL gotcha)
• The project beside src/, file by file: package.json, pnpm-workspace.yaml (hoisted linker, canvas overrides, the canvas-svg stand-in), nativescript.config.ts, webpack.config.js with chainSolidTV, tsconfig.json, App_Resources
• The boot file — the demo's app/app.ts without its measurement code
• Siri Remote key mapping, and the Menu contract behind Config.preventDefaultOnHandledKeys: onBack must return false on the root screen so Menu can leave the app (the one change the demo's src/ needed)
• App lifecycle, simulator and physical-device builds, console-only debugging with mirrorConsole
• Limitations: video, SVG, compressed textures, image workers, pointer input

For the reviewer

• The setup does not work from npm yet. It needs the releases after @solidtv/solid 1.6.3 (Config.preventDefaultOnHandledKeys, merged in feat(focus): preventDefault for a consumed key, behind a config flag #64 but unreleased), @solidtv/renderer 1.9.3 (setDefaultPlatform, Platform.resolveSettings) and @solidtv/nativescript 0.1.1 (bindCanvas, the full shims, mirrorConsole). The page says so in a Version requirements note and shows the link: sibling checkouts the demo uses. Once those ship, the note should go and the link: entries become version pins.
• Not build-tested from the page. The commands and configs are taken from the demo's project and the host repo's docs; I did not run a tvOS build while writing it.
• DEVELOPMENT_TEAM is a <YOUR_TEAM_ID> placeholder — the demo's xcconfig files carry a real team id, which is deliberately not copied here.
• Play/Pause arrives as MediaPlayPause (179), which is not in SolidTV's default key map; the page tells readers to map it.
• Docs only: no source or test changes. prettier --check passes on both files.

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