fix(ios): separate dev/release build paths and enable media autoplay
- build-ios.sh: create bootstrap HTML instead of copying bundled assets for dev mode
- dev-ios-sim.sh: add host IP detection, vite on 0.0.0.0, patch bootstrap with port
- dev-bootstrap.html: minimal redirect to localhost dev server
- WebviewPlugin.swift: enable media autoplay (mediaTypesRequiringUserActionForPlayback)