实验页"评价项"和自测：提交前自己检查，不计分

- 工具栏"评价项"打开侧栏，列出自动检查的功能项（作业显示布置时的规则和各项分值）
- "自己检查"在服务器上按评分规则运行学生现在的程序，逐项显示通过与否和原因；不计分、不留记录，
  自由练习和作业都能用；每人同时一次，结果保留到下一次，之后改过代码提示结果可能过时；
  和提交评分共用全站并发上限
- 实验的评价项接口学生也能用（老师布置作业的对话框改用它）
- 修正：运行区的窗体和"放大"按钮会盖住网页的抽屉和对话框

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

server/src/grading/queue.ts

@@ -1,6 +1,7 @@
 // 评分队列：学生提交后立即返回，后台按提交顺序评分（同时最多评 MAX_ACTIVE 份），结果写回数据库。
 // 服务器重启前没评完的提交，启动时继续评。评完调用 onGraded（接着做 AI 评阅）。
 import type { Database } from 'bun:sqlite'
+import type { SourceFile } from '@iot/shared'
 import { mkdir, rm } from 'node:fs/promises'
 import { dirname, join } from 'node:path'
 import { assignmentChecks, pendingSubmissionIds, saveGrade, submissionForGrading } from '../assignments'
@@ -10,6 +11,16 @@ import { grade } from './grader'
 
 const MAX_ACTIVE = 3
 
+/** 把作品写进一个干净的工程目录（评分和自测用） */
+export async function writeProject(dir: string, files: SourceFile[]) {
+  await rm(dir, { recursive: true, force: true })
+  for (const file of files) {
+    const target = safeJoin(dir, file.path)
+    await mkdir(dirname(target), { recursive: true })
+    await Bun.write(target, file.content)
+  }
+}
+
 export function createGradingQueue(db: Database, onGraded: (submissionId: number) => void = () => {}) {
   const queue: number[] = []
   let active = 0
@@ -21,12 +32,7 @@ export function createGradingQueue(db: Database, onGraded: (submissionId: number
     if (!submission || !checks) return
     const dir = join(config.runsDir, `grade-${id}`)
     try {
-      await rm(dir, { recursive: true, force: true })
-      for (const file of submission.files) {
-        const target = safeJoin(dir, file.path)
-        await mkdir(dirname(target), { recursive: true })
-        await Bun.write(target, file.content)
-      }
+      await writeProject(dir, submission.files)
       saveGrade(db, id, await grade(dir, checks, submission.sampleId))
       onGraded(id)
     } catch (error) {