feat(SQL 题): 增删改题的期望结果标出执行后变了的格子，删掉的行写清是哪几行

学生原来只能拿两张表逐格对，看不出要改的是哪几行。现在改过的格子、新插的行标黄，
删掉的行在表下面写「删掉了 2 行（id 是 2、3）」。按第一列配对，对不上就不标。
数据表和期望结果抽成一个组件，后台出题页的预览也用它。
题型判断统一走契约的 isSqlProblem()。

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

apps/api/src/routes/classroom.ts

@@ -1,4 +1,5 @@
 import {
+  isSqlProblem,
   classComparisonRequestSchema,
   STUDENT_ROLES,
   classLessonRequestSchema,
@@ -929,7 +930,7 @@ classroomRoutes.put("/classroom/lesson", requireTeacher, async (c) => {
   // SQL 题除外：它只收 SQL，C 的作业里夹一道也不会让人选错语言，计数那边也放行了 SQL
   if (language) {
     const unsupported = found
-      .filter((row) => !row.languages.includes(language) && !row.languages.includes("SQL"))
+      .filter((row) => !row.languages.includes(language) && !isSqlProblem(row))
       .map((row) => row.displayId)
     if (unsupported.length) {
       return failure(

apps/api/src/routes/contest.ts

@@ -1,4 +1,5 @@
 import {
+  isSqlProblem,
   contestPasswordRequestSchema,
   STUDENT_ROLES,
   type Contest,
@@ -244,7 +245,7 @@ contestRoutes.get(
             allowFlowchart: problem.allowFlowchart,
             showFlowchart: problem.showFlowchart,
             hasAstRules: problem.astRules !== null,
-            isSql: problem.languages.includes("SQL"),
+            isSql: isSqlProblem(problem),
             myStatus: myStatusOf(statuses, problem.id),
             // 按人数是公开题库列表的列；比赛题表看的是榜单，不下发
             solvedUsers: 0,

apps/api/src/routes/problem.ts

@@ -1,4 +1,5 @@
 import {
+  isSqlProblem,
   normalizeLanguage,
   problemListSortSchema,
   problemTypeFilterSchema,
@@ -121,7 +122,7 @@ function listItem(
     allowFlowchart: row.problem.allowFlowchart,
     showFlowchart: row.problem.showFlowchart,
     hasAstRules: row.problem.astRules !== null,
-    isSql: row.problem.languages.includes("SQL"),
+    isSql: isSqlProblem(row.problem),
     // 流程图评到 A / S 也打勾：problemStates 已经把它算进 solved
     myStatus: states?.solved.has(id)
       ? JudgeStatus.ACCEPTED