fix(backend): fix Ruff B904 errors in chart.py

- Add 'from None' to exception chaining in chart API
- Remove unused imports (auto-fixed by ruff)

Author: OpenClaw

backend/app/api/endpoints/chart.py

@@ -78,6 +78,6 @@ async def get_chart(source: str, chart_type: str, limit: int = 50):
             ],
         }
     except ValueError as e:
-        raise HTTPException(status_code=400, detail=str(e))
+        raise HTTPException(status_code=400, detail=str(e)) from None
     except Exception as e:
-        raise HTTPException(status_code=500, detail=f"获取榜单数据失败: {str(e)}")
+        raise HTTPException(status_code=500, detail=f"获取榜单数据失败: {str(e)}") from None

backend/app/api/endpoints/download.py

@@ -2,7 +2,7 @@
 Download API 端点 - 下载管理
 """
 
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter
 from pydantic import BaseModel
 
 router = APIRouter(prefix="/download", tags=["下载管理"])

backend/app/api/endpoints/mediaserver.py

@@ -2,7 +2,7 @@
 MediaServer API 端点 - 媒体服务器管理
 """
 
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter
 from pydantic import BaseModel
 
 router = APIRouter(prefix="/mediaserver", tags=["媒体服务器"])

backend/app/api/endpoints/organize.py

@@ -2,7 +2,7 @@
 Organize API 端点 - 文件整理管理
 """
 
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter
 from pydantic import BaseModel
 
 from app.modules.organize.organize_module import OrganizeModule

backend/tests/unit/modules/chart/test_netease_fetcher.py

@@ -1,9 +1,10 @@
 """网易云音乐榜单抓取器测试"""
 
+
 import pytest
-from datetime import datetime
+
+from app.modules.chart.fetchers.base import ChartData
 from app.modules.chart.fetchers.netease import NeteaseChartFetcher
-from app.modules.chart.fetchers.base import ChartData, ChartEntry
 
 
 class TestNeteaseChartFetcher:

backend/tests/unit/modules/chart/test_qq_music_fetcher.py

@@ -1,9 +1,10 @@
 """QQ音乐榜单抓取器测试"""
 
+
 import pytest
-from datetime import datetime
+
+from app.modules.chart.fetchers.base import ChartData
 from app.modules.chart.fetchers.qq_music import QQMusicChartFetcher
-from app.modules.chart.fetchers.base import ChartData, ChartEntry
 
 
 class TestQQMusicChartFetcher:

backend/tests/unit/modules/organize/test_id3_writer.py

@@ -1,8 +1,9 @@
 """ID3 标签写入测试"""
 
+from unittest.mock import MagicMock, patch
+
 import pytest
-from datetime import datetime
-from unittest.mock import Mock, patch, MagicMock
+
 from app.modules.organize.id3_writer import ID3Writer
 
 

backend/tests/unit/modules/organize/test_organize_module.py

@@ -1,11 +1,12 @@
 """Organize Module 测试"""
 
-import pytest
-from pathlib import Path
 from datetime import datetime
-from unittest.mock import Mock, patch
+from unittest.mock import patch
+
+import pytest
+
+from app.modules.organize.models import OrganizeStatus, OrganizeTask
 from app.modules.organize.organize_module import OrganizeModule
-from app.modules.organize.models import OrganizeTask, OrganizeStatus
 
 
 class TestOrganizeModule:

backend/tests/unit/modules/ptsite/test_site_extensions.py

@@ -1,11 +1,12 @@
 """PT 站点扩展测试"""
 
+from unittest.mock import AsyncMock, MagicMock, patch
+
 import pytest
-from datetime import datetime
-from unittest.mock import Mock, patch, AsyncMock, MagicMock
+
+from app.modules.site.models import SiteConfig, TorrentInfo
 from app.modules.site.sites.mteam import MTeamSite
 from app.modules.site.sites.opencd import OpenCDSite
-from app.modules.site.models import TorrentInfo, SiteConfig
 
 
 class TestMTeamSite:

backend/tests/unit/modules/subscribe/test_chart_subscription.py

@@ -1,8 +1,9 @@
 """榜单订阅集成测试 - TDD"""
 
-import pytest
 from datetime import datetime
-from unittest.mock import Mock, patch, AsyncMock
+from unittest.mock import AsyncMock, patch
+
+import pytest
 
 
 class TestChartSubscription:
@@ -28,7 +29,7 @@ def test_chart_source_enum_exists(self):
 
     def test_subscription_model_chart_fields(self):
         """测试 Subscription 模型有榜单字段 🆕"""
-        from app.modules.subscribe.models import Subscription, SubscriptionType, ChartSource
+        from app.modules.subscribe.models import ChartSource, Subscription, SubscriptionType
 
         sub = Subscription(
             type=SubscriptionType.CHART,
@@ -57,9 +58,9 @@ async def test_subscribe_module_exists(self):
     @pytest.mark.asyncio
     async def test_process_chart_subscription(self):
         """测试处理榜单订阅 🆕"""
-        from app.modules.subscribe.subscribe_module import SubscribeModule
-        from app.modules.subscribe.models import Subscription, SubscriptionType, ChartSource
         from app.modules.chart.fetchers.base import ChartData, ChartEntry
+        from app.modules.subscribe.models import ChartSource, Subscription, SubscriptionType
+        from app.modules.subscribe.subscribe_module import SubscribeModule
 
         # Mock ChartData
         mock_chart_data = ChartData(
@@ -101,9 +102,8 @@ async def test_process_chart_subscription(self):
     @pytest.mark.asyncio
     async def test_chart_subscription_deduplication(self):
         """测试榜单订阅去重 🆕"""
-        from app.modules.subscribe.subscribe_module import SubscribeModule
-        from app.modules.subscribe.models import Subscription, SubscriptionType, ChartSource
         from app.modules.chart.fetchers.base import ChartEntry
+        from app.modules.subscribe.subscribe_module import SubscribeModule
 
         subscribe_module = SubscribeModule()