修复：CI 部署环境与 ref 错配、迁移碎片化、图片意图 source_span、章节物化脏版式、会话历史与本地语音不一致

新增：TTS 上传 COS 与分片、章节 reading_segments 物化与快照、markdown 清洗、会话消息 repository、语音 store 重构与相关测试

api/app/features/conversation/session_history.py

@@ -50,14 +50,19 @@ def segments_to_redis_history(segments: List[Segment]) -> List[Dict[str, Any]]:
         vsid = _voice_session_id_from_audio_url(seg.audio_url)
         if vsid:
             human["voiceSessionId"] = vsid
+        ads = getattr(seg, "audio_duration_seconds", None)
+        if ads is not None and ads > 0:
+            human["durationSeconds"] = int(ads)
         history.append(human)
         if seg.agent_response and seg.agent_response.strip():
-            history.append(
-                {
-                    "role": "ai",
-                    "content": seg.agent_response.strip(),
-                    "messageType": "text",
-                    "timestamp": ts,
-                }
-            )
+            ai_item: Dict[str, Any] = {
+                "role": "ai",
+                "content": seg.agent_response.strip(),
+                "messageType": "text",
+                "timestamp": ts,
+            }
+            tts = getattr(seg, "tts_audio_urls", None)
+            if isinstance(tts, list) and tts:
+                ai_item["ttsAudioUrls"] = [u for u in tts if isinstance(u, str)]
+            history.append(ai_item)
     return history