chore: 从汽车AI客服项目拷贝骨架并清理(blog页/redis)

Co-Authored-By: Claude Code <noreply@anthropic.com>

tests/test_enum_app.py

@@ -0,0 +1,6 @@
+from app.models.database import ConversationSource
+
+
+def test_app_source_exists():
+    assert ConversationSource("app") is ConversationSource.app
+    assert ConversationSource.app.value == "app"