fix: astro() marks all pipeline features as used (#16899)

* fix: astro() marks all pipeline features as used

AstroHandler is the batteries-included handler that wires up every
pipeline feature internally. Mark all PipelineFeatures bits at the
top of handle() so the one-shot warnMissingFeatures check in BaseApp
never fires a false positive when the first request short-circuits
(e.g. a redirect route skips middleware).

* add changeset

* move allFeatures mask to base-pipeline.ts per review