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/platformio.ini

@@ -3,7 +3,7 @@
 
 [env:esp32s3]
 platform = espressif32
-board = esp32-s3-devkitc-1
+board = esp32-s3-devkitc1-n16r8
 framework = arduino
 
 ; NimBLE for BLE (lighter than BlueDroid), NeoPixel for status LED
@@ -12,9 +12,7 @@ lib_deps =
     adafruit/Adafruit NeoPixel@^1.12
 
 build_flags =
-    -DBOARD_HAS_PSRAM
-    -DBOARD_HAS_PSRAM_OPI
-    ; Serial via CP2102N UART0 port, not USB-CDC
+    ; Serial via CH343 UART port, not USB-CDC
     -DARDUINO_USB_CDC_ON_BOOT=0
 
 monitor_speed = 115200

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);