Add a development-server based remote hot reload so script/resource changes
made on the host are synced and reloaded live on devices whose game bundle is
read-only (iOS app bundle, Android APK).
- Implement the previously stubbed `eve dev` command as a small HTTP file
server (GET /manifest, /raw/<path>, /ping) serving a game directory.
- Extend HotReload with a background remote-sync client: poll the server
manifest, compare mtime/size, download changed files into a writable overlay
directory mounted at "/" via the new Filesystem::mountRealDirectory, and
queue changed virtual paths for the script layer to dofile/reload.
- Wire it into load.nut: config.devServer/devSyncMs, shared handle_change(),
poll_remote_reload(), and a `eve run --dev-server <url>` CLI override.
- Add iOS/Android hot-reload dir helpers and cleartext-HTTP platform config
(iOS ATS + NSLocalNetworkUsageDescription, Android usesCleartextTraffic).
- Add test/remotesync.cpp covering overlay shadowing, end-to-end sync, and
unreachable-recovery; update docs.
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