* fix(jsx/dom): apply select value after children are rendered

When options and value were set simultaneously on a select element,
the value was applied before option children existed in the DOM,
causing selectedIndex to fall back to 0.

Defer select value assignment to after children rendering, similar
to Preact's approach. This ensures options exist in the DOM before
value matching, while other props like `multiple` are still applied
before children.

* fix(jsx/dom): fix select value sync edge cases

For multiple selects with no matching option, selectedIndex was
incorrectly forced to 0. Only reset selectedIndex for single
selects, preserving the browser's default -1 for unmatched
multiple selects.

* perf(jsx/dom): use child.tag instead of el.nodeName for select check

Avoid DOM property access in the hot render loop by checking the
JSX node's tag property directly.

Compressed content is not byte-identical to the original, so strong
ETags violate HTTP semantics (RFC 9110). Convert them to weak ETags
by adding the W/ prefix, matching the behavior of nginx, Apache, and
Express.

Adds a comprehensive @example block and fully documents the @param and @returns tags for the  middleware to help developers understand its capabilities regarding allowList/denyList out of the box.