feat(conversation): TTS 投递与 WebSocket 管线；客户端播放门禁与会话页联动；COS 键与迁移脚本调整

app-expo/src/core/ws/client.ts

@@ -49,6 +49,7 @@ function mapServerMessage(raw: RawServerMessage): WsEvent | null {
         audioUrl: d.audio_url as string | undefined,
         index: d.index as number | undefined,
         total: d.total as number | undefined,
+        assistantMessageId: d.assistant_message_id as string | undefined,
       };
 
     case 'end_conversation':
@@ -166,6 +167,10 @@ export class WsClient {
     return this.send({ type: 'text', data: { text } });
   }
 
+  sendTtsCancel(): boolean {
+    return this.send({ type: 'tts_cancel', data: {} });
+  }
+
   sendEndConversation(): boolean {
     return this.send({ type: 'end_conversation', data: {} });
   }

app-expo/src/core/ws/types.ts

@@ -14,6 +14,7 @@ export type ClientMessageType =
   | 'audio_segment'
   | 'audio_message'
   | 'transcribe_only'
+  | 'tts_cancel'
   | 'end_conversation';
 
 export interface RawServerMessage {
@@ -63,6 +64,8 @@ export interface TtsAudioReceivedEvent {
   audioUrl?: string;
   index?: number;
   total?: number;
+  /** 持久化后的助手消息 id（与 REST `messages` 中 `id` 对齐） */
+  assistantMessageId?: string;
 }
 
 export interface ConversationEndedEvent {