fix: 评分标准直读 DB，移除缓存层

electron/main/ipc.ts

@@ -262,31 +262,21 @@ export function setupIpc(win: BrowserWindow): void {
       const q = questions[i]
       insert.run(q.questionTitle || '', q.maxScore ?? 100, q.referenceAnswer || '', q.rubric || '', i)
     }
-    rubricPayload = data
   })
 
   ipcMain.handle('rubric:getData', () => {
-    function fromDb() {
-      const d = getDb()
-      const rows: any[] = d.prepare('SELECT * FROM rubric ORDER BY sort_order').all()
-      if (rows.length) {
-        return {
-          questions: rows.map(r => ({
-            questionTitle: r.question_title,
-            maxScore: r.max_score,
-            referenceAnswer: r.reference_answer,
-            rubric: r.rubric
-          })),
-          currentIndex: 0
-        }
+    const d = getDb()
+    const rows: any[] = d.prepare('SELECT * FROM rubric ORDER BY sort_order').all()
+    if (rows.length) {
+      return {
+        questions: rows.map(r => ({
+          questionTitle: r.question_title,
+          maxScore: r.max_score,
+          referenceAnswer: r.reference_answer,
+          rubric: r.rubric
+        })),
+        currentIndex: 0
       }
-      return null
-    }
-    if (rubricPayload && rubricPayload.questions?.length) return rubricPayload
-    const dbResult = fromDb()
-    if (dbResult) {
-      rubricPayload = dbResult
-      return dbResult
     }
     return null
   })
@@ -300,7 +290,6 @@ export function setupIpc(win: BrowserWindow): void {
 }
 
 const dialogPayloads: Record<string, any> = {}
-let rubricPayload: any = null
 let gradingPayload: any = null
 
 async function callAiApi(imageBase64: string, rubric: string, config: { apiKey: string; baseUrl: string; model: string }, extras?: { maxScore?: number; referenceAnswer?: string; questionTitle?: string }): Promise<{