Add LilyGO T-Deck Max (e-paper) base board support (#552)

Devices/lilygo-tdeck-max/device.properties

@@ -0,0 +1,31 @@
+general.vendor=LilyGO
+general.name=T-Deck Max
+# SD card support is not yet working; remove once it is functional.
+general.incubating=true
+
+apps.launcherAppId=Launcher
+
+hardware.target=ESP32S3
+hardware.flashSize=16MB
+hardware.flashMode=DIO
+hardware.spiRam=true
+hardware.spiRamMode=AUTO
+hardware.spiRamSpeed=80M
+hardware.tinyUsb=true
+hardware.esptoolFlashFreq=80M
+hardware.bluetooth=true
+
+# Internal until the SD card is verified working on this board; switch to SD then.
+storage.userDataLocation=Internal
+
+display.size=3.1"
+display.shape=rectangle
+display.dpi=128
+
+# The GDEQ031T10 e-paper is monochrome, but its driver renders via
+# LV_COLOR_FORMAT_I1 on its own display. The global LVGL color depth must stay
+# at 16: esp_lvgl_port refuses to compile with LV_COLOR_DEPTH_1 set.
+lvgl.colorDepth=16
+# Monochrome theme: the default colour theme renders accent-coloured UI that
+# thresholds to invisible on a 1bpp panel (enables CONFIG_LV_USE_THEME_MONO).
+lvgl.theme=Mono