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On ESP32, millis() truncates esp_timer_get_time() to 32-bit, then Scheduler::millis_64_() reconstructs 64-bit using 193 bytes of CAS/atomic/lock rollover tracking code. This is unnecessary since esp_timer_get_time() already provides native 64-bit microseconds. Add millis_64() as a HAL-level function alongside millis(): - ESP32: native esp_timer_get_time()/1000 (26 bytes, lock-free) - Other platforms: delegate to Scheduler::millis_64_impl_() which retains the existing rollover tracking (renamed from millis_64_) Saves 344 bytes flash and ~8 bytes RAM on ESP32 by eliminating the rollover tracking code and associated atomic fields. External callers (uptime, web_server) now use millis_64() directly instead of App.scheduler.millis_64().
