Add lesson content editor, quiz test endpoint, and lesson update API

- Backend: UpdateLesson handler (PUT /lessons/:id) for editing title, content, quiz questions
- Backend: TestQuiz handler (POST /lessons/:id/quiz-test) for quiz evaluation without enrollment
- Frontend: Content editor with markdown textarea, save, and approve-for-video workflow
- Frontend: Fix quiz endpoint to /lessons/:id/quiz-test

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-compliance/lib/sdk/academy/api.ts

@@ -321,11 +321,11 @@ export async function generateCertificate(enrollmentId: string): Promise<Certifi
 // =============================================================================
 
 /**
- * Quiz-Antworten einreichen und auswerten
+ * Quiz-Antworten einreichen und auswerten (ohne Enrollment)
  */
 export async function submitQuiz(lessonId: string, answers: SubmitQuizRequest): Promise<SubmitQuizResponse> {
   return fetchWithTimeout<SubmitQuizResponse>(
-    `${ACADEMY_API_BASE}/lessons/${lessonId}/quiz`,
+    `${ACADEMY_API_BASE}/lessons/${lessonId}/quiz-test`,
     {
       method: 'POST',
       body: JSON.stringify(answers)
@@ -333,6 +333,25 @@ export async function submitQuiz(lessonId: string, answers: SubmitQuizRequest):
   )
 }
 
+/**
+ * Lektion aktualisieren (Content, Titel, Quiz-Fragen)
+ */
+export async function updateLesson(lessonId: string, update: {
+  title?: string
+  description?: string
+  content_url?: string
+  duration_minutes?: number
+  quiz_questions?: Array<{ question: string; options: string[]; correct_index: number; explanation: string }>
+}): Promise<{ lesson: any }> {
+  return fetchWithTimeout(
+    `${ACADEMY_API_BASE}/lessons/${lessonId}`,
+    {
+      method: 'PUT',
+      body: JSON.stringify(update)
+    }
+  )
+}
+
 // =============================================================================
 // STATISTICS
 // =============================================================================