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perf: improvements for request handling (#487)

* perf: improvements for request handling
- avoid allocating a closure & a promise if handler is not asynchronous for applyHandler()
- avoid allocating a promise in handle(middleware, pathname)
- Change "if (a.b == null) a.b = x" to "a.b ??= x" and similar patterns

* fix: add type assertion for async handler return type

TypeScript doesn't narrow the Handler union type based on the
Symbol.toStringTag runtime check, so we need to cast the result
to Promise<void> when calling .catch().

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: changeset

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Co-authored-by: v1rtl <hi@v1rtl.site>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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