fix/various fixes

api/app/features/memoir/chapter_markdown_compose.py

@@ -0,0 +1,39 @@
+"""
+按 chapter_story_links 顺序将各 story 正文物化为单一 markdown（无 LLM）。
+保留 story 内 asset:// 引用不变。
+"""
+
+from typing import Any
+
+
+def compose_ordered_stories_to_markdown(
+    ordered: list[tuple[str, str]],
+) -> str:
+    """
+    :param ordered: (story_title, canonical_markdown) 已按阅读顺序排好
+    :return: 章节级 markdown；每个故事为 ## 标题 + 正文，故事之间用 markdown 水平线 --- 分隔
+      （配图在 story 正文中，自然落在该故事块内、--- 之前）
+    """
+    parts: list[str] = []
+    for title, md in ordered:
+        title = (title or "").strip() or "故事"
+        body = (md or "").strip()
+        parts.append(f"## {title}\n\n{body}" if body else f"## {title}")
+    return "\n\n---\n\n".join(parts)
+
+
+def materialize_chapter_markdown_from_loaded_chapter(chapter: Any) -> str:
+    """要求 chapter.story_links 已 eager-load，且各 link.story 可用。"""
+    links = sorted(
+        list(getattr(chapter, "story_links", None) or []),
+        key=lambda x: getattr(x, "order_index", 0),
+    )
+    pairs: list[tuple[str, str]] = []
+    for link in links:
+        st = getattr(link, "story", None)
+        if st is None:
+            continue
+        title = (getattr(st, "title", None) or "").strip()
+        body = (getattr(st, "canonical_markdown", None) or "").strip()
+        pairs.append((title, body))
+    return compose_ordered_stories_to_markdown(pairs)