Compressed assets, deferred chat, lazy locales, long-lived caching

A bundle of related perf wins for the admin app landed in one pass:

• Asset compression at build time on static files (CSS, JS, fonts, SVG) so the bytes on the wire shrink dramatically.
• The support chat widget defers on every auth screen — there is no point loading a customer support chat on a page someone is using to sign in.
• Locale bundles are now lazy-loaded by route, instead of shipping every supported language's translations to every visitor.
• The static asset directory gets long-lived immutable cache headers, so returning visitors hit a warm cache the moment they arrive.

Each of these on their own is a single-digit percent win. Stacked together they meaningfully change how quickly the app feels ready, especially on second visits.