stop fetching blog index on every next config load

[mooncitydev]

what changed

removed the side-effect import of \scripts/download-blog-posts.data.json.mjs\ from
ext.config.mjs.

why

that script runs \etchPosts()\ at module load (top-level \�wait), so it ran whenever Next loaded the config — including
ext dev\ and
ext build. that meant every build depended on reaching \�log.scroll.cat, added latency, and could fail in offline or locked-down CI even though the blog list is already checked in under \src/assets/blog/.

updating the list is already a separate step via \yarn fetch:bloglist\ /
pm run fetch:bloglist\ in package.json, so the config import was redundant for normal builds.

testing

not run here (local node_modules install had issues); change is a one-line removal of an import.

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