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badf09164e
Replace the std::chrono::steady_clock approach with the scheduler's existing millis_64() rollover tracking. This avoids pulling in gettimeofday_r, system_clock, and the ArduinoJson int64_t serializer template, saving ~270 bytes of flash and 8 bytes of RAM on ESP8266. Send uptime as uint32_t seconds (good for ~136 years) instead of int64_t milliseconds.
