Search H&M product listings by free-text keyword

Runs a free-text keyword search on H&M and returns products with pricing, images, colors, and per-size stock, plus search-quality metadata (a spelling-correction suggestion, related searches, and a content-filter flag). Unlike category browsing, an obscure or nonsense keyword returns a genuine empty result (zero products) rather than a fallback set. Pagination is page-based and real: requesting a page beyond the real last page returns a normal response with an empty products array rather than an error.