- Add ntp.c to CMakeLists.txt SRCS so it's compiled and linked
- Load ntp_server from NVS in load_nvs_config() (default: pool.ntp.org)
- Add ntp_server field to spaxel_state_t
- Initialize NTP after WiFi connects with 10s sync timeout, WARN on failure
- Re-sync NTP after WiFi reconnect (WIFI_LOST state)
- Start periodic 10-minute resync timer via esp_timer
- Add ntp_synced boolean to health JSON message
- Handle ntp_server field in downstream config message
- Fix periodic resync callback to properly stop/restart SNTP
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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