chore: prepare production deploy with API hardening and Railway adapter
* Harden API routes with rate limits, upload cap, and edit dedupe. Protect expensive endpoints from abuse, reject oversized mood uploads, dedupe concurrent edit-images calls, and surface Kakao search failures instead of silent mock fallback. Co-authored-by: Cursor <cursoragent@cursor.com> * chore: switch to adapter-node for Railway deploy --------- Co-authored-by: Cursor <cursoragent@cursor.com>
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