Fix board ID and NimBLE 2.x API for ESP32-S3-N16R8

- Use esp32-s3-devkitc1-n16r8 board (16MB flash, 8MB PSRAM OPI)
  instead of generic esp32-s3-devkitc-1 (8MB, no PSRAM)
- Remove setScanResponse() — NimBLE 2.x dropped this method
- Board definition handles PSRAM build flags automatically

Verified: clean boot, no PSRAM errors, BLE advertising as Travler-G2.

firmware/ble-bridge/src/main.cpp

@@ -103,7 +103,6 @@ static void initBLE() {
     NimBLEAdvertising *pAdv = NimBLEDevice::getAdvertising();
     pAdv->addServiceUUID(NUS_SERVICE_UUID);
     pAdv->setAppearance(0x0080);  // Generic Computer
-    pAdv->setScanResponse(true);
     NimBLEDevice::startAdvertising();
 
     Serial.printf("[BLE] Advertising as \"%s\"\n", BLE_DEVICE_NAME);