Convert all projects to PlatformIO

- JC3636W518 sketches: pioarduino 51.03.05 (Arduino core 3.0.5), ESP32-S3
  16MB QIO / OPI PSRAM, vendor libs via lib_extra_dirs, per-project lv_conf.h
- display_gif_embedded uses default_16MB.csv (firmware 3.4 MB > huge_app)
- elm327_wifi_bridge: espressif32 6.10.0 on esp32dev, pinned lib_deps
- elmulator: library in lib/, one env per example, duplicate copies removed
- .ino -> src/main.cpp, headers/lv_conf.h -> include/

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

10-OBD-Display-2024/elmulator/platformio.ini

@@ -0,0 +1,27 @@
+; ELMulator — fake ELM327 OBD-II adapter for testing without a car.
+; Runs on a CLASSIC ESP32 (Bluetooth Classic SPP). Library lives in lib/ELMulator.
+; One env per example:  pio run -e simple | custom | wifi
+
+[platformio]
+default_envs = simple
+
+[env]
+platform = espressif32@6.10.0
+board = esp32dev
+framework = arduino
+board_build.partitions = huge_app.csv
+; upload_port = COMxx   ; the classic ESP32's port (COM21 is the JC3636W518)
+monitor_speed = 115200
+monitor_filters = esp32_exception_decoder
+
+; all Mode 01 PIDs answered with mock data, BT name "ELMULATOR"
+[env:simple]
+build_src_filter = +<simple/>
+
+; custom PID handler + DTC response, BT name "ELMULATOR"
+[env:custom]
+build_src_filter = +<custom/>
+
+; custom handler, BT name "OBDII" (matches what elm327_wifi_bridge connects to)
+[env:wifi]
+build_src_filter = +<wifi/>