Add HW-069 v1.1 4-digit TM1637 test with SoftSPI touch and LVGL.

CLK on GPIO22, DIO on GPIO27; value/brightness/colon controls and flashable firmware/cyd package.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/digit.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdint.h>
+
+void digit_init();
+
+void digit_set_on(bool on);
+bool digit_is_on();
+
+/** 显示数值 0..9999（超出钳位） */
+void digit_set_value(int value);
+int digit_get_value();
+
+/** 亮度 0..100，映射到 TM1637 8 档 */
+void digit_set_brightness(uint8_t percent);
+uint8_t digit_brightness();
+
+void digit_set_colon(bool on);
+bool digit_colon();
+
+void digit_clear();