重构代码，实现相对导入

rag_indexer/cli.py

@@ -7,8 +7,12 @@ import logging
 import sys
 from pathlib import Path
 
-from rag_indexer.index_builder import IndexBuilder, IndexBuilderConfig
-from rag_indexer.splitters import SplitterType
+# 添加项目根目录和 backend 目录到 Python 路径
+sys.path.insert(0, str(Path(__file__).parent.parent))
+sys.path.insert(0, str(Path(__file__).parent.parent / "backend"))
+
+from .index_builder import IndexBuilder, IndexBuilderConfig
+from .splitters import SplitterType
 
 logging.basicConfig(
     level=logging.INFO,