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/user/repo.py

@@ -3,6 +3,10 @@
 from sqlalchemy import delete, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.core.cos_url_keys import (
+    collect_cos_keys_from_tts_url_list,
+    extract_cos_object_key_if_owned,
+)
 from app.features.asset.models import Asset
 from app.features.auth.models import RefreshToken
 from app.features.conversation.models import Conversation, Segment
@@ -96,6 +100,19 @@ async def collect_object_storage_keys_before_purge(
         )
         keys.update(x for x in r3.scalars().all() if x)
 
+    seg_rows = await db.execute(
+        select(Segment.audio_url, Segment.tts_audio_urls)
+        .join(Conversation, Segment.conversation_id == Conversation.id)
+        .where(Conversation.user_id == user_id)
+    )
+    for audio_url, tts_urls in seg_rows.all():
+        k = extract_cos_object_key_if_owned(audio_url)
+        if k:
+            keys.add(k)
+        keys |= collect_cos_keys_from_tts_url_list(
+            tts_urls if isinstance(tts_urls, list) else None
+        )
+
     return sorted(keys)