feat(memoir): 回忆录分段两阶段管线（Phase1 分类 / Phase2 叙事）与配置、测试

api/app/agents/memoir/narrative_agent.py

@@ -8,6 +8,7 @@ from __future__ import annotations
 import json
 from typing import Any, Dict, Optional
 
+from app.agents.stage_constants import CHAPTER_CATEGORIES
 from app.agents.memoir.prompts import (
     get_creative_title_json_prompt,
     get_narrative_json_prompt,
@@ -34,7 +35,7 @@ class NarrativeAgent:
     ) -> str:
         """生成创意标题。若无 LLM 则返回默认标题"""
         if not llm:
-            return f"{stage} 回忆"
+            return f"{CHAPTER_CATEGORIES.get(stage, stage)} 回忆"
         try:
             prompt = get_creative_title_json_prompt(
                 stage=stage,
@@ -53,10 +54,10 @@ class NarrativeAgent:
             title = (data.get("title") or "").strip() if isinstance(data, dict) else ""
             if title:
                 return title.strip('"')
-            return f"{stage} 回忆"
+            return f"{CHAPTER_CATEGORIES.get(stage, stage)} 回忆"
         except Exception as e:
             logger.warning("NarrativeAgent 生成标题失败: {}", e)
-            return f"{stage} 回忆"
+            return f"{CHAPTER_CATEGORIES.get(stage, stage)} 回忆"
 
     def generate_narrative(
         self,