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

Drivers/GDEQ031T10/README.md

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+# GDEQ031T10
+
+Display driver for the GoodDisplay GDEQ031T10, a 3.1" 320x240 SPI e-paper panel
+(UC8253-family controller) used by the LilyGO T-Deck Pro/Max.
+
+The command sequence (panel setting, power on/off, fast/partial LUT timings, deep
+sleep) is ported from the vendor reference driver in
+[Xinyuan-LilyGO/T-Deck-MAX](https://github.com/Xinyuan-LilyGO/T-Deck-MAX)
+(`examples/Elink_paper/GDEQ031T10_Arduino/Display_EPD_W21.cpp`).
+
+Unlike `EPDiyDisplay` (which targets parallel-bus "EPD47"-style panels via the
+`epdiy` library), this panel uses a simple 4-wire SPI interface (CS/DC/RST/BUSY +
+SCK/MOSI), so it's driven directly with ESP-IDF's `spi_master` and `gpio` APIs
+rather than `epdiy` or `esp_lcd_panel`.
+
+Each LVGL flush is staged and handed off to a dedicated refresh task (the physical
+refresh takes hundreds of ms to over a second, too long to run in LVGL's flush
+callback without stalling input). The task diffs the new frame against a shadow of
+what the panel currently holds and, where possible, performs a windowed partial
+refresh of just the changed region instead of redrawing the whole panel. A full
+refresh is still done on the first draw, on an explicit `requestFullRefresh()`,
+when a change covers most of the screen, or periodically to clear the ghosting
+that partial updates accumulate (gated by `MAX_PARTIAL_REFRESHES`, with a
+localized ghost-clear preferred over a full flash when the accumulated changes are
+confined to a small region). The panel's charge pump is powered off once the
+refresh task's queue goes idle, not after every single refresh. Four refresh
+modes are available, trading speed for quality:
+
+- `Full` (~3s) - best quality, used by default
+- `Fast` (~1.0s)
+- `Slow` (~1.5s)
+- `Partial` (~0.5s) - most ghosting
+
+`requestFullRefresh()` forces the next flush to use `Full` mode, useful for
+clearing up ghosting accumulated from a run of fast/partial refreshes.