fix/various fixes

api/app/features/memoir/narrative_to_markdown.py

@@ -0,0 +1,33 @@
+"""将 NarrativeAgent / LLM 返回的 JSON 或纯文本规范为 markdown 正文。"""
+
+from __future__ import annotations
+
+import json
+
+
+def narrative_to_markdown(narrative: str) -> str:
+    """
+    将 narrative（JSON paragraphs 或纯文本）转为 markdown。
+    与已删除的 ChapterComposerOrchestrator._to_markdown 行为一致。
+    """
+    if not narrative or not str(narrative).strip():
+        return ""
+    stripped = narrative.strip()
+    if stripped.startswith("{") and "paragraphs" in stripped:
+        try:
+            data = json.loads(stripped)
+            paras = data.get("paragraphs", [])
+            if isinstance(paras, list):
+                parts = []
+                for p in paras:
+                    if isinstance(p, dict):
+                        text = p.get("content", p.get("text", ""))
+                    else:
+                        text = str(p)
+                    if text.strip():
+                        parts.append(text.strip())
+                return "\n\n".join(parts)
+            return stripped
+        except json.JSONDecodeError:
+            return stripped
+    return stripped