Port display_gif_sd and display_speed_wifi to LVGL 9.6 + shared library

- both use shared/jc3636w518.ini, board library and perf monitor
- GIF decoded in the display color format, loop delay 1 ms,
  per-loop memory prints removed
- lv_conf: LVGL drive A: = SD card via LV_USE_FS_STDIO (/sdcard/)
- shared/README.md, CLAUDE.md and project README updated

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

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

@@ -1,28 +1,10 @@
-; JC3636W518 — ESP32-S3R8, 16 MB QIO flash, 8 MB OPI PSRAM, 360x360 ST77916 QSPI + CST816S
-; Settings mirror the vendor Arduino IDE setup (2-Program Example/Demo_Arduino/docs/Arduino set up.png)
+; GIF from the SD card (A:wallpaper.gif) — JC3636W518, common settings in shared/jc3636w518.ini
+
+[platformio]
+extra_configs = ../../shared/jc3636w518.ini
+
+[shared]
+dir = ../../shared
 
 [env:jc3636w518]
-; pioarduino = Arduino core 3.0.5 (ESP32_Display_Panel 0.1.4 needs core 3.x)
-platform = https://github.com/pioarduino/platform-espressif32/releases/download/51.03.05/platform-espressif32.zip
-board = esp32-s3-devkitc-1
-framework = arduino
-
-board_build.arduino.memory_type = qio_opi
-board_build.flash_mode = qio
-board_upload.flash_size = 16MB
-board_build.partitions = huge_app.csv
-
-build_flags =
-    -DBOARD_HAS_PSRAM
-    -DARDUINO_USB_CDC_ON_BOOT=1
-    ; LVGL (also when compiled as a library) picks up include/lv_conf.h of this project
-    -DLV_CONF_INCLUDE_SIMPLE
-    -Iinclude
-
-; vendor-bundled libraries: ESP32_Display_Panel 0.1.4, ESP32_IO_Expander 0.0.2, lvgl 8.3.11
-lib_extra_dirs = ../../2-Program Example/Demo_Arduino/library
-
-upload_port = COM21
-monitor_port = COM21
-monitor_speed = 115200
-monitor_filters = esp32_exception_decoder
+extends = jc3636w518