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_session_history.py

@@ -39,6 +39,19 @@ class SegmentsToRedisHistoryTest(unittest.TestCase):
         self.assertEqual(h[0]["messageType"], "audio")
         self.assertEqual(h[0]["voiceSessionId"], "vs-9")
 
+    def test_voice_segment_includes_duration_seconds_when_set(self):
+        seg = Segment(
+            id="s1",
+            conversation_id="c1",
+            transcript_text="嗯",
+            audio_url="audio-segment:vs-9:0",
+            audio_duration_seconds=12,
+            created_at=datetime(2024, 1, 2, tzinfo=timezone.utc),
+            agent_response=None,
+        )
+        h = segments_to_redis_history([seg])
+        self.assertEqual(h[0]["durationSeconds"], 12)
+
 
 if __name__ == "__main__":
     unittest.main()