feat: 移除轮播图管理，系列活动改卡片布局，课程描述限10行，首页配置优化

backend/competition/views.py

@@ -3,12 +3,12 @@ from rest_framework.decorators import action, api_view, permission_classes
 from rest_framework.response import Response
 from django.db.models import Q
 from shop.utils import get_current_wechat_user
-from .models import Competition, CompetitionEnrollment, Project, ProjectFile, Score, Comment, ScoreDimension, HomePageConfig, CarouselItem
+from .models import Competition, CompetitionEnrollment, Project, ProjectFile, Score, Comment, ScoreDimension, HomePageConfig
 from .serializers import (
     CompetitionSerializer, CompetitionEnrollmentSerializer, 
     ProjectSerializer, ProjectFileSerializer, 
     ScoreSerializer, CommentSerializer, ScoreDimensionSerializer,
-    HomePageConfigSerializer, CarouselItemSerializer
+    HomePageConfigSerializer
 )
 
 from rest_framework.pagination import PageNumberPagination
@@ -28,22 +28,6 @@ def get_homepage_config(request):
         return Response({"error": str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
 
 
-class CarouselItemViewSet(viewsets.ModelViewSet):
-    """轮播图项目管理"""
-    queryset = CarouselItem.objects.all()
-    serializer_class = CarouselItemSerializer
-    permission_classes = [permissions.AllowAny]
-    filter_backends = [filters.SearchFilter]
-    search_fields = ['title']
-    
-    def get_queryset(self):
-        queryset = CarouselItem.objects.all()
-        carousel_type = self.request.query_params.get('carousel_type')
-        if carousel_type:
-            queryset = queryset.filter(carousel_type=carousel_type)
-        return queryset
-
-
 class StandardResultsSetPagination(PageNumberPagination):
     page_size = 10
     page_size_query_param = 'page_size'