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/app/(sdk)/sdk/academy/[id]/page.tsx

@@ -18,6 +18,7 @@ import {
   fetchEnrollments,
   deleteCourse,
   submitQuiz,
+  updateLesson,
   generateVideos,
   getVideoStatus
 } from '@/lib/sdk/academy/api'
@@ -39,6 +40,11 @@ export default function CourseDetailPage() {
   const [isSubmittingQuiz, setIsSubmittingQuiz] = useState(false)
   const [videoStatus, setVideoStatus] = useState<any>(null)
   const [isGeneratingVideos, setIsGeneratingVideos] = useState(false)
+  const [isEditing, setIsEditing] = useState(false)
+  const [editContent, setEditContent] = useState('')
+  const [editTitle, setEditTitle] = useState('')
+  const [isSaving, setIsSaving] = useState(false)
+  const [saveMessage, setSaveMessage] = useState<{ type: 'success' | 'error', text: string } | null>(null)
 
   useEffect(() => {
     const loadData = async () => {
@@ -89,6 +95,65 @@ export default function CourseDetailPage() {
     }
   }
 
+  const handleStartEdit = () => {
+    if (!selectedLesson) return
+    setEditContent(selectedLesson.contentMarkdown || '')
+    setEditTitle(selectedLesson.title || '')
+    setIsEditing(true)
+    setSaveMessage(null)
+  }
+
+  const handleCancelEdit = () => {
+    setIsEditing(false)
+    setSaveMessage(null)
+  }
+
+  const handleSaveLesson = async () => {
+    if (!selectedLesson) return
+    setIsSaving(true)
+    setSaveMessage(null)
+    try {
+      await updateLesson(selectedLesson.id, {
+        title: editTitle,
+        content_url: editContent,
+      })
+      const updatedLesson = { ...selectedLesson, title: editTitle, contentMarkdown: editContent }
+      setSelectedLesson(updatedLesson)
+      if (course) {
+        const updatedLessons = course.lessons.map(l => l.id === updatedLesson.id ? updatedLesson : l)
+        setCourse({ ...course, lessons: updatedLessons })
+      }
+      setIsEditing(false)
+      setSaveMessage({ type: 'success', text: 'Lektion gespeichert.' })
+    } catch (error: any) {
+      setSaveMessage({ type: 'error', text: error.message || 'Fehler beim Speichern.' })
+    } finally {
+      setIsSaving(false)
+    }
+  }
+
+  const handleApproveLesson = async () => {
+    if (!selectedLesson) return
+    if (!confirm('Lektion fuer Video-Verarbeitung freigeben? Der Text wird als final markiert.')) return
+    setIsSaving(true)
+    setSaveMessage(null)
+    try {
+      await updateLesson(selectedLesson.id, {
+        description: 'approved_for_video',
+      })
+      const updatedLesson = { ...selectedLesson }
+      if (course) {
+        const updatedLessons = course.lessons.map(l => l.id === updatedLesson.id ? updatedLesson : l)
+        setCourse({ ...course, lessons: updatedLessons })
+      }
+      setSaveMessage({ type: 'success', text: 'Lektion fuer Video-Verarbeitung freigegeben.' })
+    } catch (error: any) {
+      setSaveMessage({ type: 'error', text: error.message || 'Fehler bei der Freigabe.' })
+    } finally {
+      setIsSaving(false)
+    }
+  }
+
   const handleGenerateVideos = async () => {
     setIsGeneratingVideos(true)
     try {
@@ -285,16 +350,70 @@ export default function CourseDetailPage() {
             {selectedLesson ? (
               <div className="space-y-6">
                 <div className="flex items-center justify-between">
-                  <h2 className="text-xl font-semibold text-gray-900">{selectedLesson.title}</h2>
-                  <span className={`px-3 py-1 text-xs rounded-full ${
-                    selectedLesson.type === 'quiz' ? 'bg-yellow-100 text-yellow-700' :
-                    selectedLesson.type === 'video' ? 'bg-blue-100 text-blue-700' :
-                    'bg-gray-100 text-gray-600'
-                  }`}>
-                    {selectedLesson.type === 'quiz' ? 'Quiz' : selectedLesson.type === 'video' ? 'Video' : 'Text'}
-                  </span>
+                  {isEditing ? (
+                    <input
+                      type="text"
+                      value={editTitle}
+                      onChange={e => setEditTitle(e.target.value)}
+                      className="text-xl font-semibold text-gray-900 border border-gray-300 rounded-lg px-3 py-1 flex-1 mr-3"
+                    />
+                  ) : (
+                    <h2 className="text-xl font-semibold text-gray-900">{selectedLesson.title}</h2>
+                  )}
+                  <div className="flex items-center gap-2">
+                    <span className={`px-3 py-1 text-xs rounded-full ${
+                      selectedLesson.type === 'quiz' ? 'bg-yellow-100 text-yellow-700' :
+                      selectedLesson.type === 'video' ? 'bg-blue-100 text-blue-700' :
+                      'bg-gray-100 text-gray-600'
+                    }`}>
+                      {selectedLesson.type === 'quiz' ? 'Quiz' : selectedLesson.type === 'video' ? 'Video' : 'Text'}
+                    </span>
+                    {selectedLesson.type !== 'quiz' && !isEditing && (
+                      <>
+                        <button
+                          onClick={handleStartEdit}
+                          className="px-3 py-1 text-sm bg-gray-100 text-gray-700 rounded-lg hover:bg-gray-200 transition-colors"
+                        >
+                          Bearbeiten
+                        </button>
+                        <button
+                          onClick={handleApproveLesson}
+                          disabled={isSaving}
+                          className="px-3 py-1 text-sm bg-green-600 text-white rounded-lg hover:bg-green-700 transition-colors disabled:opacity-50"
+                        >
+                          Freigeben
+                        </button>
+                      </>
+                    )}
+                    {isEditing && (
+                      <>
+                        <button
+                          onClick={handleCancelEdit}
+                          className="px-3 py-1 text-sm bg-gray-100 text-gray-700 rounded-lg hover:bg-gray-200 transition-colors"
+                        >
+                          Abbrechen
+                        </button>
+                        <button
+                          onClick={handleSaveLesson}
+                          disabled={isSaving}
+                          className="px-3 py-1 text-sm bg-purple-600 text-white rounded-lg hover:bg-purple-700 transition-colors disabled:opacity-50"
+                        >
+                          {isSaving ? 'Speichert...' : 'Speichern'}
+                        </button>
+                      </>
+                    )}
+                  </div>
                 </div>
 
+                {/* Save/Approve Message */}
+                {saveMessage && (
+                  <div className={`p-3 rounded-lg text-sm ${
+                    saveMessage.type === 'success' ? 'bg-green-50 text-green-700 border border-green-200' : 'bg-red-50 text-red-700 border border-red-200'
+                  }`}>
+                    {saveMessage.text}
+                  </div>
+                )}
+
                 {/* Video Player */}
                 {selectedLesson.type === 'video' && selectedLesson.videoUrl && (
                   <div className="aspect-video bg-gray-900 rounded-xl overflow-hidden">
@@ -306,8 +425,23 @@ export default function CourseDetailPage() {
                   </div>
                 )}
 
-                {/* Text Content */}
-                {(selectedLesson.type === 'text' || selectedLesson.type === 'video') && selectedLesson.contentMarkdown && (
+                {/* Text Content - Edit Mode */}
+                {isEditing && (selectedLesson.type === 'text' || selectedLesson.type === 'video') && (
+                  <div className="space-y-2">
+                    <label className="text-sm text-gray-500">Inhalt (Markdown)</label>
+                    <textarea
+                      value={editContent}
+                      onChange={e => setEditContent(e.target.value)}
+                      rows={20}
+                      className="w-full border border-gray-300 rounded-xl p-4 text-sm font-mono text-gray-800 leading-relaxed resize-y focus:ring-2 focus:ring-purple-500 focus:border-transparent"
+                      placeholder="Markdown-Inhalt der Lektion..."
+                    />
+                    <p className="text-xs text-gray-400">Unterstuetzt: # Ueberschrift, ## Unterueberschrift, - Aufzaehlung, **fett**</p>
+                  </div>
+                )}
+
+                {/* Text Content - View Mode */}
+                {!isEditing && (selectedLesson.type === 'text' || selectedLesson.type === 'video') && selectedLesson.contentMarkdown && (
                   <div className="prose prose-sm max-w-none">
                     <div className="whitespace-pre-wrap text-gray-700 leading-relaxed">
                       {selectedLesson.contentMarkdown.split('\n').map((line, i) => {

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
 // =============================================================================