feat(power): switch to physical power-key shutdown control

components/platform/include/platform.h

@@ -90,6 +90,21 @@ esp_err_t platform_mic_key_init(void);
 void platform_mic_key_deinit(void);
 esp_err_t platform_mic_key_set_event_callback(platform_mic_key_event_cb_t cb, void *user_data);
 
+// ---------- power_key ----------
+typedef enum {
+    PLATFORM_POWER_KEY_EVENT_LONG_PRESS = 0,
+    PLATFORM_POWER_KEY_EVENT_PRESS_UP,
+} platform_power_key_event_t;
+
+typedef void (*platform_power_key_event_cb_t)(platform_power_key_event_t event, void *user_data);
+
+esp_err_t platform_power_key_init(void);
+void platform_power_key_deinit(void);
+esp_err_t platform_power_key_set_event_callback(platform_power_key_event_cb_t cb, void *user_data);
+
+// Controls the board hold line: true keeps power on, false releases hold.
+esp_err_t platform_power_hold_set(bool hold_on);
+
 // ---------- voice_audio ----------
 typedef struct {
     uint32_t sample_rate;