PERF.2 Apps: the 532 KB language catalog inlined in every app page (65 % of the HTML, never cached) as a cached static file per build and locale

Measured 2026-11-08: /use/cadcraft is 828 KB of HTML (205 KB gzipped) and 532 KB of it is <script id="cc-lang"> (8,818 strings; cmd 83 KB, shell 82 KB, frame 32 KB, m3d 28 KB...), regenerated and sent on every page view because the page itself is dynamic. Readers: assets/js/app-shell.js, app-boot.js, app-lang-boot.js, i18n.js (one copy per app), supercadcraft.js, super-tools.js, exact-client.js; all read #cc-lang synchronously.

Plan: Lang::bootTag writes a small tag and the catalog moves to a classic script /assets/apps/<slug>/<version>/lang/<locale>.boot.js?v= (or a generated file under a cache folder for the shell part) that sets window.ccLangCatalog, loaded with the week-long asset cache; the readers take window.ccLangCatalog first, #cc-lang second (so frozen releases and the browser edition keep working). Second visit: 0 bytes for strings instead of about 100 KB gzipped. Releases are frozen so the file can be written at release time (bin/release-app.php); a Discord member builds generate it on demand keyed by the lab stamp. Keep Lang::use (PHP needs the shell strings for the bar and Settings).