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4f3c95ced2
Switch all web_server callers from getParam()/hasParam() to arg()/hasArg().
Both APIs exist on Arduino ESPAsyncWebServer and our IDF implementation.
On the IDF side, getParam() allocated a new AsyncWebParameter on the heap
for every successful lookup, cached it in a vector, and required cleanup
in the destructor. No caller ever held the pointer or called getParam
twice with the same name - every use was just getParam("x")->value()
immediately.
Rewrite IDF arg()/hasArg() to call query_key_value() directly, bypassing
getParam entirely. The linker strips the now-unreferenced getParam,
AsyncWebParameter, and cache machinery.
Saves ~348 bytes flash on ESP32-IDF, ~272 bytes on ESP8266 Arduino.
