Implement verified curriculum, video review, watch sessions, ledger safeguards, and remove demo data

backend/app/Services/AiVideoAnalyzerService.php

@@ -201,6 +201,16 @@ class AiVideoAnalyzerService
         // Perform Gemini AI or Curriculum-grounded Analysis
         $analysisResult = self::generateAnalysis($lessonTitle, $duration, $curriculum);
 
+        if (($analysisResult['status'] ?? '') === 'needs_evidence_review') {
+            return [
+                'status' => 'needs_evidence_review',
+                'lesson_id' => $lessonId,
+                'message' => 'لا يمكن نشر فصول أو أسئلة للفيديو من دون تفريغ زمني ومراجعة تربوية مرتبطة بالدرس.',
+                'timeline_chapters' => [],
+                'checkpoints_count' => 0,
+            ];
+        }
+
         // 1. Save Timeline Chapters to lessons table
         if (!empty($analysisResult['timeline_chapters'])) {
             Database::query(
@@ -407,6 +417,15 @@ class AiVideoAnalyzerService
      */
     private static function generateAnalysis(string $lessonTitle, int $duration, array $curriculum): array
     {
+        // This legacy signature receives neither a timestamped transcript nor
+        // the approved Markdown version. It must never create publishable
+        // video claims, even when an AI key happens to be configured.
+        return [
+            'timeline_chapters' => [],
+            'socratic_checkpoints' => [],
+            'status' => 'needs_evidence_review',
+        ];
+
         $geminiKey = self::nextGeminiApiKey();
 
         if (!empty($geminiKey)) {
@@ -482,8 +501,14 @@ class AiVideoAnalyzerService
             }
         }
 
-        // High-Precision Curriculum Grounded Engine (Offline / Safe Fallback)
-        return self::buildGroundedCurriculumAnalysis($lessonTitle, $duration, $curriculum);
+        // A title and curriculum outline do not prove what appears at a given
+        // moment in the video. Do not publish chapters or questions without
+        // transcript evidence and a successful review workflow.
+        return [
+            'timeline_chapters' => [],
+            'socratic_checkpoints' => [],
+            'status' => 'needs_evidence_review',
+        ];
     }
 
     /**