Add custom board definition with Launchpad X VID/PID (0x1235/0x0103)

- boards/launchpad_x_variant.json defines custom board
- platformio.ini uses custom board
- Board sets VID/PID at hardware level

platformio.ini

@@ -3,8 +3,15 @@
 
 [env:esp32s3]
 platform = espressif32
-board = esp32-s3-devkitc-1
-framework = arduino
+board = launchpad_x_variant
+board_build.arduino.memory_type = qio_opi
+board_build.partitions = default_8MB.csv
+board_build.arduino.vid = 0x1235
+board_build.arduino.pid = 0x0103
+board_build.arduino.usb_mode = 0
+board_build.arduino.usb_cdc_on_boot = 1
+board_build.arduino.use_tinyusb = 1
+
 lib_deps =
     adafruit/Adafruit TinyUSB Library@3.1.0
     fastled/FastLED@^3.9.0
@@ -12,12 +19,4 @@ lib_deps =
 build_unflags =
     -DARDUINO_USB_MODE=1
 
-build_flags =
-    -DARDUINO_USB_MODE=0
-    -DARDUINO_USB_CDC_ON_BOOT=1
-    -DUSE_TINYUSB=1
-
 monitor_speed = 115200
-
-board_build.partitions = default_8MB.csv
-board_build.arduino.memory_type = qio_opi