feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

firmware/echoear-platform-agent/main/ble_wifi.h

@@ -0,0 +1,9 @@
+#pragma once
+#include <stdbool.h>
+#include "esp_err.h"
+
+// Called by startup before the binding worker is created, then by that worker
+// only. Preparing reserves Wi-Fi memory but does not start/associate the radio.
+esp_err_t ble_wifi_prepare(void);
+esp_err_t ble_wifi_connect(const char *ssid, const char *password);
+bool ble_wifi_connected(void);