Fix quiz API URLs and verify exam flow

src/main/webapp/app/quiz/quiz.service.ts

@@ -44,21 +44,21 @@ export interface ExamResult {
 }
 
 export async function fetchActiveSubjects(): Promise<SubjectItem[]> {
-  const response = await axios.get<SubjectItem[]>('/api/subjects?page=0&size=100');
+  const response = await axios.get<SubjectItem[]>('api/subjects?page=0&size=100');
   return response.data.filter(s => s.active);
 }
 
 export async function startExam(subjectId: number): Promise<{ attemptId: number; startedAt: string }> {
-  const response = await axios.post('/api/exam-attempts/start', { subjectId });
+  const response = await axios.post('api/exam-attempts/start', { subjectId });
   return response.data;
 }
 
 export async function loadQuestions(attemptId: number): Promise<ExamQuestionView[]> {
-  const response = await axios.get<ExamQuestionView[]>(`/api/exam-attempts/${attemptId}/questions`);
+  const response = await axios.get<ExamQuestionView[]>(`api/exam-attempts/${attemptId}/questions`);
   return response.data;
 }
 
 export async function submitExam(attemptId: number, answers: SubmitAnswer[]): Promise<ExamResult> {
-  const response = await axios.post<ExamResult>(`/api/exam-attempts/${attemptId}/submit`, { answers });
+  const response = await axios.post<ExamResult>(`api/exam-attempts/${attemptId}/submit`, { answers });
   return response.data;
 }