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_markdown_sanitize.py

@@ -0,0 +1,27 @@
+import unittest
+
+from app.features.memoir.markdown_sanitize import (
+    sanitize_story_for_chapter_compose,
+    strip_leading_heading_if_matches_title,
+    strip_markdown_tables,
+)
+
+
+class MarkdownSanitizeTest(unittest.TestCase):
+    def test_strip_table_block(self):
+        md = "第一段\n\n| a | b |\n| - | - |\n| 1 | 2 |\n\n第二段"
+        out = strip_markdown_tables(md)
+        self.assertNotIn("| a |", out)
+        self.assertIn("第一段", out)
+        self.assertIn("第二段", out)
+
+    def test_strip_heading_when_matches_title(self):
+        body = "## 童年\n\n正文"
+        out = strip_leading_heading_if_matches_title(body, "童年")
+        self.assertEqual(out, "正文")
+
+    def test_sanitize_compose(self):
+        raw = "| x | y |\n|---|---|\n|1|2|\n\n你好"
+        out = sanitize_story_for_chapter_compose(raw, "T")
+        self.assertIn("你好", out)
+        self.assertNotIn("| x |", out)