전원 버튼 BSP 제거, GPIO 제어로 전환

- 전원 OFF 로직 추가(main_s)
- processing 변수 삭제

project/ble_peripheral/ble_app_bladder_patch/main.h

@@ -156,7 +156,6 @@ void ascii_format_data(uint8_t *buffer, const char *tag, const char *data_ascii,
  *============================================================================*/
 extern volatile bool data_tx_in_progress;   /* BLE TX in progress flag */
 extern volatile bool ble_connection_st;     /* BLE connection state (0=disconnected, 1=connected) */
-extern volatile bool processing;            /* Sensor data processing flag (prevents duplicate commands) */
 
 /* 2026-03-17: Global variables moved from cmd_parse.c to main.c */
 extern char SERIAL_NO[SERIAL_NO_LENGTH];           /* Serial number */