Phase 0: platformio.ini for esp32-s3 + LovyanGFX/LVGL9

- Replace m5stack-core-esp32 env with wt32-sc01-plus (freenove_esp32_s3_wroom
  board as closest N8R8 PSRAM match; WT32-SC01 Plus has no built-in board ID)
- 8MB partition table, USB CDC, PSRAM build flags
- lib_deps: LovyanGFX, lvgl@^9.2, ArduinoJson
- Add LV_CONF_INCLUDE_SIMPLE + project root include path so LVGL finds lv_conf.h
- lv_conf.h from lvgl 9.5 template, enabled (0 -> 1)
- include/board_pins.h: WT32-SC01 Plus reference pinout (ST7796 8-bit parallel
  + FT6336U I2C touch), to be verified against concrete board revision

include/board_pins.h

@@ -0,0 +1,34 @@
+#pragma once
+
+// WT32-SC01 Plus pin assignments.
+// Reference values per WT32-SC01 Plus documentation (ESP32-S3-WROVER,
+// ST7796 8-bit parallel + FT6336U capacitive touch). Verify against the
+// concrete board revision before production use (see SPEC.md section 11).
+//
+// These constants are consumed by src/display/display_setup.cpp only.
+
+namespace BoardPins {
+
+// --- ST7796 8-bit parallel RGB/8080 interface ---
+constexpr int LCD_D0 = 8;
+constexpr int LCD_D1 = 3;
+constexpr int LCD_D2 = 46;
+constexpr int LCD_D3 = 9;
+constexpr int LCD_D4 = 1;
+constexpr int LCD_D5 = 5;
+constexpr int LCD_D6 = 6;
+constexpr int LCD_D7 = 7;
+
+constexpr int LCD_WR = 39;
+constexpr int LCD_RD = 38;
+constexpr int LCD_DC = 40;
+constexpr int LCD_CS = 41;
+constexpr int LCD_RST = 42;
+constexpr int LCD_BACKLIGHT = 2;
+
+// --- FT6336U capacitive touch (I2C) ---
+constexpr int TOUCH_SDA = 14;
+constexpr int TOUCH_SCL = 12;
+constexpr int TOUCH_INT = 13;
+
+} // namespace BoardPins

platformio.ini

@@ -0,0 +1,23 @@
+[env:wt32-sc01-plus]
+platform = espressif32
+board = freenove_esp32_s3_wroom
+framework = arduino
+monitor_speed = 115200
+board_build.partitions = default_8MB.csv
+board_build.filesystem = none
+upload_speed = 921600
+
+build_flags =
+    -DCORE_DEBUG_LEVEL=1
+    -DARDUINO_USB_MODE=1
+    -DARDUINO_USB_CDC_ON_BOOT=1
+    -DBOARD_HAS_PSRAM
+    -DARDUINO_RUNNING_CORE=1
+    -DARDUINO_EVENT_RUNNING_CORE=1
+    -DLV_CONF_INCLUDE_SIMPLE
+    -I${PROJECT_DIR}
+
+lib_deps =
+    lovyan03/LovyanGFX@^1.2.0
+    lvgl/lvgl@^9.2.0
+    bblanchon/ArduinoJson@^6.21.5