feat(lightrag): Add document status tracking and checkpoint support

功能(lightrag): 添加文档状态跟踪和断点续传支持

- Add DocStatus enum and DocProcessingStatus class for document processing state management
- 添加 DocStatus 枚举和 DocProcessingStatus 类用于文档处理状态管理

- Implement JsonDocStatusStorage for persistent status storage
- 实现 JsonDocStatusStorage 用于持久化状态存储

- Add document-level deduplication in batch processing
- 在批处理中添加文档级别的去重功能

- Add checkpoint support in ainsert method for resumable document processing
- 在 ainsert 方法中添加断点续传支持，实现可恢复的文档处理

- Add status query methods for monitoring processing progress
- 添加状态查询方法用于监控处理进度

- Update LightRAG initialization to support document status tracking
- 更新 LightRAG 初始化以支持文档状态跟踪

lightrag/kg/age_impl.py

@@ -1,7 +1,8 @@
 import asyncio
 import inspect
 import json
-import os, sys
+import os
+import sys
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
 from typing import Any, Dict, List, NamedTuple, Optional, Tuple, Union
@@ -22,8 +23,10 @@ from ..base import BaseGraphStorage
 
 if sys.platform.startswith("win"):
     import asyncio.windows_events
+
     asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
 
+
 class AGEQueryException(Exception):
     """Exception for the AGE queries."""