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- Fix typo in OTA update status API endpoint (/ota_udpate_status → /ota_update_status) - Replace WebSocket-based update progress with polling mechanism - Add OTA lifecycle callbacks (started, finished, progress, error) - Implement check_update_task with internet connectivity verification - Add LittleFS/SPIFFS update support - Simplify update progress page to use 90-second delay and polling instead of real-time WebSocket updates This refactor improves reliability by checking internet connectivity before attempting updates and simplifies the frontend by removing WebSocket complexity in favor of a timeout-based polling approach.