Add test submission feature for LLM checks without creating submissions; update API and UI components to support new functionality, enhancing task evaluation for teachers and challenge authors. Update localization for test check messages in English and Russian.

src/types/challenge.ts

@@ -226,3 +226,19 @@ export interface SystemStatsV2 {
   chainsDetailed: ChainDetailed[]
 }
 
+// ========== Submissions / Checking ==========
+
+export interface SubmitRequest {
+  userId: string
+  taskId: string
+  result: string
+  // Флаг тестового режима: проверка без создания Submission и очереди
+  isTest?: boolean
+}
+
+export interface TestSubmissionResult {
+  isTest: true
+  status: Exclude<SubmissionStatus, 'pending' | 'in_progress'>
+  feedback?: string
+}
+