SCADABLE platform integration for ESP32. Boots, loads the
device certificate from NVS, discovers the MQTT broker via
edge.scadable.com, connects over TLS, publishes heartbeats,
and handles OTA updates. Optional streaming file upload to
uploads.scadable.com (compile-time opt-in). Customer brings
their own network (Wi-Fi / Ethernet / cellular).
An embedded HTTP server wrapping server lifecycle management, filesystem-backed static file serving, and handler registration into a small, thread-safe interface on top of the native ESP-IDF `esp_http_server` API. It is suitable for use in system services, provisioning flows, and device configuration UIs.