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/memoir/asset_resolver.py

@@ -47,6 +47,11 @@ def collect_asset_ids_for_chapter(chapter) -> set[str]:
             continue
         smd = getattr(st, "canonical_markdown", None) or ""
         ids.update(collect_asset_ids_from_markdown(smd))
+        for intent in getattr(st, "image_intents", None) or []:
+            if getattr(intent, "intent_role", None) == "primary":
+                aid = getattr(intent, "asset_id", None)
+                if aid:
+                    ids.add(str(aid))
     return ids