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On ESP8266 (GCC 10.3), std::vector::push_back/emplace_back emit separate _M_realloc_insert functions even when called from only one site. Adding __attribute__((flatten)) inlines the realloc path, saving the out-of-line function overhead. Changes: - wifi: Move set_sta_priority from header to .cpp (eliminates duplicate instantiation at 2 call sites) and add flatten - web_server_base: Flatten add_handler (single push_back site) - api: Flatten accept_new_connections_ (single emplace_back site) - api: Extract push_item_ as single flattened push_back site for DeferredBatch (was 2 call sites in add_item/add_item_front) Saves ~200 bytes of flash on ESP8266, ~40 bytes on ESP32.
