feat: SQL 题测试点预览接口

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

problem/urls/admin.py

@@ -7,6 +7,7 @@ from ..views.admin import (
     ProblemAPI,
     ProblemFlowchartAIGen,
     ProblemVisibleAPI,
+    SQLTestCasePreviewAPI,
     StuckProblemsAPI,
     TestCaseAPI,
     TopACTrendAPI,
@@ -14,6 +15,7 @@ from ..views.admin import (
 
 urlpatterns = [
     path("test_case", TestCaseAPI.as_view()),
+    path("sql_test_case_preview", SQLTestCasePreviewAPI.as_view()),
     path("problem", ProblemAPI.as_view()),
     path("problem/visible", ProblemVisibleAPI.as_view()),
     path("problem/stuck", StuckProblemsAPI.as_view()),