WS刚连接成功可以进行 对话，超过30sWS断开后，语音上行停止，需要修复

components/control_plane/src/multimodal/control_plane_multimodal_runtime.c

@@ -46,6 +46,7 @@
 #define CONTROL_PLANE_DOWNSTREAM_PLAYBACK_GUARD_MS 220
 #define CONTROL_PLANE_IDLE_TRANSPORT_SHUTDOWN_MS 30000
 #define CONTROL_PLANE_WATCHDOG_TASK_STACK_SIZE 6144
+#define CONTROL_PLANE_SERVER_SUCCESS_PROMPT_FILE "/littlefs/audio_prompts/server_connect_success.opus"
 
 #ifndef CONFIG_TQ_NETWORK_TASK_CORE
 #define CONFIG_TQ_NETWORK_TASK_CORE 0
@@ -295,6 +296,13 @@ static esp_err_t control_plane_start_uplink_if_ready(void)
 
 esp_err_t control_plane_multimodal_handle_ptt_press_step(void)
 {
+    esp_err_t capture_err = control_plane_multimodal_start_capture();
+    if (capture_err != ESP_OK &&
+        capture_err != ESP_ERR_INVALID_STATE &&
+        capture_err != ESP_ERR_NOT_SUPPORTED) {
+        ESP_LOGW(TAG, "PTT capture start failed: %s", esp_err_to_name(capture_err));
+    }
+
     control_plane_multimodal_runtime_state_t state = {0};
     esp_err_t state_err = control_plane_multimodal_get_runtime_state(&state);
     if (state_err != ESP_OK) {
@@ -580,6 +588,7 @@ static void control_plane_multimodal_event_bridge(control_plane_multimodal_event
 
     switch (event) {
         case CONTROL_PLANE_MULTIMODAL_EVENT_TRANSPORT_CONNECTED:
+            (void)domain_runtime_behavior_play_prompt_file(CONTROL_PLANE_SERVER_SUCCESS_PROMPT_FILE);
             if (CONTROL_PLANE_MULTIMODAL_AUTO_START_FLAG) {
                 schedule_autostart_if_enabled();
             }