fix(serveStatic): make options parameter optional in all adapters (#4934)

* feat(serveStatic): make options parameter optional in all adapters

All properties in ServeStaticOptions are already optional. This change makes the options parameter itself optional so that serveStatic() can be called without arguments, matching the typical usage pattern where defaults suffice.

Fixes #4911

* fix: make manifest optional in cloudflare-workers ServeStaticOptions

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Co-authored-by: Maks Pikov <mixelburg@users.noreply.github.com>