admin: pre-gzip embedded static assets, add cache headers (#9918)

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The admin UI served embedded static files uncompressed and without
cache headers: embed.FS has zero mod times, so no Last-Modified, no
ETag, no 304s -- every page load re-downloaded ~700KB of css/js in
full, which gets painful over slow or tunneled links.

Gzip the static tree at generation time (go generate ./weed/admin)
and embed only the compressed mirror, shrinking the binary ~1.5MB.
The handler hands the pre-compressed bytes to gzip-capable clients,
decompresses for the rest, and sets Cache-Control, per-variant
content-hash ETags and Vary so repeat loads revalidate with a 304.
bootstrap.min.css goes 232KB -> 30KB on the wire.

A drift test keeps static_gz/ in sync with static/.

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