refactor: update result schemas and tests for improved state management and feedback modes

backend/src/validators/resultSchemas.ts

@@ -1,7 +1,5 @@
 import { z } from 'zod'
 
-const answerValueSchema = z.union([z.string(), z.array(z.string()), z.record(z.string(), z.string())])
-
 export const submitResultSchema = z.object({
   exam_id: z.number().nullable().optional(),
   title: z.string().min(1),
@@ -11,28 +9,8 @@ export const submitResultSchema = z.object({
   graded_count: z.number(),
   passing_score: z.number().optional(),
   elapsed_ms: z.number(),
-  state: z.object({
-    answers: z.record(z.string(), answerValueSchema),
-    gradedAnswers: z.record(z.string(), z.object({
-      correct: z.boolean(),
-      points: z.number(),
-      explanation: z.string().optional(),
-    })),
-    answeredCount: z.number(),
-    score: z.number(),
-    correctCount: z.number(),
-    gradedCount: z.number(),
-    timeExpired: z.boolean().optional(),
-  }),
-  exam: z.object({
-    id: z.string().optional(),
-    title: z.string(),
-    subtitle: z.string().optional(),
-    questions: z.array(z.any()),
-    timeLimitMinutes: z.number().nullable().optional(),
-    passingScore: z.number().optional(),
-    feedbackMode: z.enum(['end', 'immediate']).optional(),
-  }).passthrough(),
+  state: z.record(z.unknown()),
+  exam: z.record(z.unknown()),
 })
 
 export const resultIdParamSchema = z.object({