feat: add Bluetooth-controlled LoRa OTA

Add the framed BLE mOTA transport and companion control path, complete the full-profile build and runtime fixes, and document and test the OTA workflow.

variants/wio-e5-dev/platformio.ini

@@ -78,6 +78,7 @@ build_flags = ${lora_e5.build_flags}
   -D FLOOD_CHANNEL_SCOPE_SLOTS=7
   -D ENABLE_HWSERIAL2
   -D WITH_RS232_BRIDGE=Serial2
+  -D WITH_RS232_BRIDGE_UART=2
   -D WITH_RS232_BRIDGE_RX=PA3
   -D WITH_RS232_BRIDGE_TX=PA2
 build_src_filter = ${lora_e5.build_src_filter}