Utils (small helpers)

Path: hono-backend/src/utils/

Pure-ish functions with no HTTP and no business workflows (or only tiny shared ones).

File	What it helps with
`dto.ts`	Map Mongoose docs → safe JSON for clients (`toUserDTO`, …)
`localized-display-title.ts`	Pick Hindi/English title from localized fields
`yt-solution-url.ts`	Build/parse YouTube solution links
`yt-solution-stored.ts`	Normalize stored solution metadata
`current-affairs-date.ts`	CA date keys / formatting
`ca-local-datetime.ts`	IST-local datetime for CA
`current-affairs-search-expand.ts`	Expand search terms for CA queries
`india-study-calendar.ts`	Exam calendar helpers (India)
`nexus-entity-status.ts`	Nexus editorial status enum helpers

If a function needs DB + rules, it belongs in services/, not here.