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4b6ba05e55
std::list uses per-node heap allocation (one allocation per element) and has poor cache locality. std::vector is contiguous and uses a single allocation. Changes: - Replace std::list<Header> with std::vector<Header> in perform() virtual method signature across all platforms (IDF, Arduino, Host) - Update all start(), get(), post() overloads accordingly - Add ESPDEPRECATED overloads for std::list<Header> callers - Update online_image to use std::vector<Header> - Clean up request_headers construction in play() using structured bindings and reserve()
