feat(crowpanel-35): add Elecrow CrowPanel 3.5" (ESP32-S3, ILI9488 + GT911) touch target

- New crowpanel_35 variant: display, SD, board and target files, plus board JSON
- Portrait mode is drawn rotated 180°; landscape stays at rotation 3
- Share the GT911 touch driver between Wio Tracker L2 and CrowPanel
  (WioTrackerL2Touch.cpp -> src/helpers/input/LgfxGt911Touch.cpp)
- platformio envs, flasher/site entries, release and merge-bin support
- Tests for the CrowPanel SD codec and merge-bin

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0132MkJ7RUV32mV9F7o4PJMm

test/test_crowpanel_sd_codec.cpp

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+#include <assert.h>
+#include <string.h>
+#include "CrowPanel35SdCodec.h"
+
+int main() {
+  using namespace CrowPanel35SdCodec;
+  const uint8_t cmd0[] = {0x40, 0, 0, 0, 0};
+  const uint8_t cmd8[] = {0x48, 0, 0, 0x01, 0xAA};
+  assert(commandCrc(cmd0, sizeof cmd0) == 0x95);
+  assert(commandCrc(cmd8, sizeof cmd8) == 0x87);
+  uint16_t crc = 0;
+  for (const char* byte = "123456789"; *byte; ++byte) crc = dataCrc(crc, (uint8_t)*byte);
+  assert(crc == 0x31C3);
+
+  uint8_t csd[16] = {};
+  csd[0] = 0x40;
+  csd[8] = 0xFF;
+  csd[9] = 0xFF;
+  assert(sectorsFromCsd(csd) == 67108864);  // 32 GiB, block-addressed.
+  csd[7] = 0x3F;
+  assert(sectorsFromCsd(csd) == 0);         // 2 TiB overflows 32-bit sector count.
+  csd[0] = 0x80;
+  assert(sectorsFromCsd(csd) == 0);         // Unsupported CSD structure.
+
+  memset(csd, 0, sizeof csd);
+  csd[5] = 9;
+  csd[6] = 3;
+  csd[7] = 0xFF;
+  csd[8] = 0xC0;
+  csd[9] = 3;
+  csd[10] = 0x80;
+  assert(sectorsFromCsd(csd) == 2097152);   // 1 GiB, byte-addressed.
+  assert(validRange(100, 0, 100));
+  assert(validRange(100, 99, 1));
+  assert(!validRange(100, 100, 1));
+  assert(!validRange(100, 0, 0));
+  assert(!validRange(100, 99, 2));
+  assert(!validRange(UINT32_MAX, UINT32_MAX - 1, UINT32_MAX));
+}