fix(conversation): 离屏不丢回复、列表预热 WS 与非阻塞进入聊天

- 后端：文本/转写后 AI 生成改为独立任务，避免断连取消整轮；按需 TTS 等与 WS 改动
- 前端：RealtimeSession 重绑 UI 时恢复流式 buffer；列表 onPressIn/挂载预热、已有会话立即 push
- 同步会话相关类型、i18n、测试与 env/资源等累计改动

Co-authored-by: Cursor <cursoragent@cursor.com>

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

@@ -11,6 +11,13 @@ import type {
 export type WsEventListener = (event: WsEvent) => void;
 export type WsStateListener = (state: WsConnectionState) => void;
 
+function buildWsUrl(conversationId: string, token: string): string {
+  const baseUrl = config.wsBaseUrl.replace(/\/+$/u, '');
+  const encodedConversationId = encodeURIComponent(conversationId);
+  const encodedToken = encodeURIComponent(token);
+  return `${baseUrl}/ws/conversation/${encodedConversationId}?token=${encodedToken}`;
+}
+
 function mapServerMessage(raw: RawServerMessage): WsEvent | null {
   const cid = raw.conversation_id;
   const d = raw.data;
@@ -51,6 +58,7 @@ function mapServerMessage(raw: RawServerMessage): WsEvent | null {
         index: d.index as number | undefined,
         total: d.total as number | undefined,
         assistantMessageId: d.assistant_message_id as string | undefined,
+        manual: d.manual as boolean | undefined,
       };
 
     case 'end_conversation':
@@ -102,7 +110,7 @@ export class WsClient {
       return;
     }
 
-    const url = `${config.wsBaseUrl}/ws/conversation/${this.conversationId}?token=${token}`;
+    const url = buildWsUrl(this.conversationId, token);
 
     try {
       this.ws = new WebSocket(url);
@@ -164,14 +172,40 @@ export class WsClient {
     return true;
   }
 
-  sendText(text: string): boolean {
-    return this.send({ type: 'text', data: { text } });
+  sendText(
+    text: string,
+    opts?: { ttsThisTurn?: boolean },
+  ): boolean {
+    return this.send({
+      type: 'text',
+      data: {
+        text,
+        ...(opts?.ttsThisTurn === true ? { tts_this_turn: true } : {}),
+      },
+    });
   }
 
   sendTtsCancel(): boolean {
     return this.send({ type: 'tts_cancel', data: {} });
   }
 
+  sendTtsRequest(body: {
+    assistantMessageId: string;
+    segmentIndex: number;
+    segmentText?: string;
+  }): boolean {
+    return this.send({
+      type: 'tts_request',
+      data: {
+        assistant_message_id: body.assistantMessageId,
+        segment_index: body.segmentIndex,
+        ...(body.segmentText != null && body.segmentText !== ''
+          ? { segment_text: body.segmentText }
+          : {}),
+      },
+    });
+  }
+
   sendEndConversation(): boolean {
     return this.send({ type: 'end_conversation', data: {} });
   }