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On ESP8266 (GCC 10.3), std::vector::push_back() emits a separate _M_realloc_insert<DeferredEvent> function (198 bytes) that is only called from one site. Adding __attribute__((flatten)) forces the compiler to inline it, eliminating the out-of-line function's prologue/epilogue and call overhead. This matches what GCC 14.2 (ESP-IDF toolchain) already does naturally for the equivalent code in web_server_idf.cpp. Saves 80 bytes of flash on ESP8266.
