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/cover_eligibility.py

@@ -4,11 +4,29 @@ from __future__ import annotations
 
 from typing import Any
 
+from app.features.memoir.asset_resolver import parse_asset_refs
 from app.features.memoir.memoir_images.schema import (
     IMAGE_STATUS_FAILED,
     IMAGE_STATUS_PENDING,
 )
 
+# 正文内 ![...](asset://...) 数量需 **大于** 此值才生成/展示章节封面（与故事头图、正文配图任务独立）
+MIN_INLINE_BODY_IMAGES_FOR_CHAPTER_COVER = 3
+
+
+def count_chapter_inline_body_images(chapter: Any) -> int:
+    """统计章节 canonical_markdown 中正文插图（asset:// 图片引用）次数。"""
+    md = getattr(chapter, "canonical_markdown", None) or ""
+    return len(parse_asset_refs(md))
+
+
+def chapter_eligible_for_cover_by_inline_body_image_count(chapter: Any) -> bool:
+    """仅当正文内插图数量 > MIN_INLINE_BODY_IMAGES_FOR_CHAPTER_COVER 时才生成/展示章节封面。"""
+    return (
+        count_chapter_inline_body_images(chapter)
+        > MIN_INLINE_BODY_IMAGES_FOR_CHAPTER_COVER
+    )
+
 
 def primary_chapter_memoir_image(chapter: Any) -> Any | None:
     """章节级 MemoirImage（封面槽位）：按 order_index 最小取第一条。"""
@@ -20,13 +38,15 @@ def primary_chapter_memoir_image(chapter: Any) -> Any | None:
 
 
 def chapter_needs_cover_enqueue(chapter) -> bool:
-    """尚无 cover_asset 且章节有正文时，可派发 generate_chapter_cover。"""
+    """尚无 cover_asset、有正文、且正文内 asset 插图多于阈值时，可派发 generate_chapter_cover。"""
     if not chapter:
         return False
     if getattr(chapter, "cover_asset_id", None):
         return False
     md = (getattr(chapter, "canonical_markdown", None) or "").strip()
-    return bool(md)
+    if not md:
+        return False
+    return chapter_eligible_for_cover_by_inline_body_image_count(chapter)
 
 
 def chapter_has_cover_to_generate(chapter) -> bool: