Add fire alarm support and update firmware version to 1.0.19

- Introduced CONN_ERR_FIRE_ALARM to handle fire alarm conditions in charger control.
- Added CMD_FIRE_ALARM command for external trigger handling in serial control.
- Updated firmware version from 1.0.17 to 1.0.19.
- Integrated fire alarm functionality into the charging loop and command handler.

Core/Inc/fire_alarm.h

@@ -0,0 +1,9 @@
+#ifndef INC_FIRE_ALARM_H_
+#define INC_FIRE_ALARM_H_
+
+#include <stdint.h>
+
+uint8_t FireAlarm_IsLatched(void);
+void FireAlarm_Activate(void);
+
+#endif /* INC_FIRE_ALARM_H_ */