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/tests/test_story_image_tasks.py

@@ -73,7 +73,6 @@ class GenerateStoryImageTaskTest(unittest.TestCase):
             style_profile="watercolor",
             story_version_id="ver-1",
             caption="主插图",
-            source_span={"paragraph_index": 0},
             status="processing",
         )
         story = SimpleNamespace(
@@ -89,7 +88,7 @@ class GenerateStoryImageTaskTest(unittest.TestCase):
             id="intent-1",
             story_version_id="ver-1",
             caption="主插图",
-            source_span={"paragraph_index": 0},
+            prompt_brief="院子里的藤椅",
             status="processing",
             style_profile="watercolor",
             claim_token="claim-token",