feat(memory,conversation): 记忆富化/证据包、时间线幂等字段与对话分段全链路

数据库
- 新增迁移 0003：timeline_events.memory_source_id 外键 → memory_sources，便于按 ingest 源做时间线幂等

后端 - 记忆
- 新增 ingest 后 LLM 富化（摘要/事实/时间线），可配置开关与最大字符数
- 新增证据包组装：合并 chunk、摘要、事实、时间线、故事等检索结果；支持空 query 时是否仍带 rolling 等开关
- repo/retriever/service/router/schemas/summarizer/timeline/extractor 等扩展；文档 memory-retrieval.md 更新

后端 - 对话 WS
- 增加 PING/PONG；分段 ASR 日志与空音频处理；转写失败与「无助手回复」错误提示更明确
- 助手多段回复持久化使用统一分隔符，与分段逻辑一致

后端 - Agent
- reply_limits：按 [SPLIT] 与段落拆段，并保证非空 fallback，供 WS 与 TTS 多段下发

后端 - 回忆录任务
- transcript ingest 记录 source_id；任务成功结?

app-expo/src/core/audio/audio-focus.ts

@@ -1,6 +1,7 @@
-import { setAudioModeAsync } from 'expo-audio';
+import { setAudioModeAsync, setIsAudioActiveAsync } from 'expo-audio';
 
 type AudioOwner = 'recorder' | 'player' | null;
+type ActiveAudioOwner = Exclude<AudioOwner, null>;
 type OwnerChangeListener = (owner: AudioOwner) => void;
 
 let currentOwner: AudioOwner = null;
@@ -22,7 +23,7 @@ export const audioFocus = {
     if (currentOwner === 'recorder') return true;
 
     if (currentOwner === 'player') {
-      await this.release();
+      await this.releaseIfOwnedBy('player');
     }
 
     await setAudioModeAsync({
@@ -59,11 +60,17 @@ export const audioFocus = {
       playsInSilentMode: false,
       allowsRecording: false,
     });
+    await setIsAudioActiveAsync(false);
 
     currentOwner = null;
     notify();
   },
 
+  async releaseIfOwnedBy(owner: ActiveAudioOwner): Promise<void> {
+    if (currentOwner !== owner) return;
+    await this.release();
+  },
+
   getCurrentOwner(): AudioOwner {
     return currentOwner;
   },

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

@@ -37,6 +37,7 @@ function mapServerMessage(raw: RawServerMessage): WsEvent | null {
         text: d.text as string,
         index: d.index as number | undefined,
         total: d.total as number | undefined,
+        assistantMessageId: d.assistant_message_id as string | undefined,
         isTransition: d.transition as boolean | undefined,
         segmentIndex: d.segment_index as number | undefined,
       };

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

@@ -53,6 +53,8 @@ export interface AgentResponseEvent {
   text: string;
   index?: number;
   total?: number;
+  /** 落库后的助手消息 id；多段时每段独立 WS，与 TTS 的 index 一起定位气泡 */
+  assistantMessageId?: string;
   isTransition?: boolean;
   segmentIndex?: number;
 }