feat(voice): migrate to push2talk and serialize websocket text sends

components/platform/include/platform.h

@@ -95,6 +95,18 @@ esp_err_t platform_display_show_png(const uint8_t *png,
 void platform_display_mark_shared_spi_dirty(void);
 void platform_display_deinit(void);
 
+// ---------- mic_key ----------
+typedef enum {
+    PLATFORM_MIC_KEY_EVENT_PRESS_DOWN = 0,
+    PLATFORM_MIC_KEY_EVENT_PRESS_UP,
+} platform_mic_key_event_t;
+
+typedef void (*platform_mic_key_event_cb_t)(platform_mic_key_event_t event, void *user_data);
+
+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);
+
 // ---------- voice_audio ----------
 typedef struct {
     uint32_t sample_rate;