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_setup.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <stdbool.h>
+// Returns true when BLE owns startup (including pending binding recovery).
+bool ble_setup_start_if_needed(void);
+// Called only for a physical short tap. Returns true if the tap is consumed.
+bool ble_setup_confirm(void);