Initial commit — firmware WireClaw ESP32-S3 fonctionnel

- Heartbeat MAVLink v1 toutes les 1s (broadcast 192.168.4.255:14553)
- Relais WiFi <-> UART (Jetson <-> Pi Zero) sur ports 14550-14553
- LED RGB WS2812 GPIO48 : rouge pulsé (attente), vert dim (idle), flash vert (heartbeat)
- MODE_AP=true : hotspot WireClaw-CAM / false : connexion Jetson
- Fix: retrait ARDUINO_USB_CDC_ON_BOOT (carte Freenove utilise CH343/UART0)

platformio.ini

@@ -0,0 +1,17 @@
+[env:freenove_esp32s3]
+platform = espressif32
+board = esp32-s3-devkitc-1
+framework = arduino
+
+board_build.flash_mode = qio
+board_build.f_flash = 80000000L
+board_build.partitions = default_8MB.csv
+board_upload.flash_size = 8MB
+
+build_flags =
+
+lib_deps =
+    fastled/FastLED @ ^3.6.0
+
+monitor_speed = 115200
+upload_speed = 460800