feat(题目列表): SQL 题混在一般题里看不出来，点进去才发现不是写 C——和画流程图一样挂「SQL」标签，「全部类型」里也能单独筛

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/oj/transforms.ts

@@ -23,6 +23,7 @@ export function toProblemRow(result: ProblemListItem): ProblemRow {
     allowFlowchart: result.allowFlowchart,
     showFlowchart: result.showFlowchart,
     hasAstRules: result.hasAstRules,
+    isSql: result.isSql,
     solvedUsers: result.solvedUsers,
     triedUsers: result.triedUsers,
   }