fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解
- 清理未使用的导入
- 统一字符串格式化为f-string
- 修复行长度超过120字符的问题

backend/main.py

@@ -18,6 +18,7 @@ from datetime import datetime, timedelta
 from typing import Any, Optional
 
 import httpx
+from export_manager import ExportEntity, ExportRelation, ExportTranscript
 from fastapi import (
     Body,
     Depends,
@@ -33,12 +34,9 @@ from fastapi import (
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse, PlainTextResponse, StreamingResponse
 from fastapi.staticfiles import StaticFiles
-from pydantic import BaseModel, Field
-from export_manager import ExportEntity
-from export_manager import ExportRelation
-from export_manager import ExportTranscript
 from ops_manager import OpsManager
 from plugin_manager import PluginManager
+from pydantic import BaseModel, Field
 
 # Configure logger
 logger = logging.getLogger(__name__)
@@ -1166,7 +1164,7 @@ async def create_manual_entity(
                 start_pos=entity.start_pos,
                 end_pos=entity.end_pos,
                 text_snippet=text[
-                    max(0, entity.start_pos - 20) : min(len(text), entity.end_pos + 20)
+                    max(0, entity.start_pos - 20): min(len(text), entity.end_pos + 20)
                 ],
                 confidence=1.0,
             )
@@ -1408,7 +1406,7 @@ async def upload_audio(project_id: str, file: UploadFile = File(...), _=Depends(
                 start_pos=pos,
                 end_pos=pos + len(name),
                 text_snippet=full_text[
-                    max(0, pos - 20) : min(len(full_text), pos + len(name) + 20)
+                    max(0, pos - 20): min(len(full_text), pos + len(name) + 20)
                 ],
                 confidence=1.0,
             )
@@ -1534,7 +1532,7 @@ async def upload_document(project_id: str, file: UploadFile = File(...), _=Depen
                 start_pos=pos,
                 end_pos=pos + len(name),
                 text_snippet=full_text[
-                    max(0, pos - 20) : min(len(full_text), pos + len(name) + 20)
+                    max(0, pos - 20): min(len(full_text), pos + len(name) + 20)
                 ],
                 confidence=1.0,
             )