Add touch buttons for speaker toggle and music playback.

Enable SoftSPI touch, replace auto beeps with Speaker ON/OFF and Play Music controls, and document usage.

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

include/pins.h

@@ -14,5 +14,17 @@
 // 板载 SC8002B 功放 → P4 喇叭座（DAC2）
 #define SPEAKER_PIN 26
 
+// 触摸 XPT2046（SoftSPI，避开 VSPI）
+#define TOUCH_IRQ  36
+#define TOUCH_MOSI 32
+#define TOUCH_MISO 39
+#define TOUCH_CLK  25
+#define TOUCH_CS   33
+
+// 物理竖屏分辨率（TFT 驱动）
 #define SCREEN_WIDTH  240
 #define SCREEN_HEIGHT 320
+
+// 横屏逻辑分辨率（LV_DISPLAY_ROTATION_270）
+#define UI_HOR_RES 320
+#define UI_VER_RES 240