feat: SEO Power Engine backend updates and remove temp media files

src/modules/gemini/gemini.service.ts

@@ -273,10 +273,11 @@ IMPORTANT: Only output valid JSON, no markdown code blocks or other text.`;
 
       // En-boy oranına göre yönlendirmeyi zorla
       const orientation = aspectRatio === '9:16' ? '(VERTICAL / PORTRAIT)' : aspectRatio === '16:9' ? '(HORIZONTAL / LANDSCAPE)' : '(SQUARE)';
-      // Gemini modelleri talimat kelimelerinden ("Generate an image of...") ziyade doğrudan görsel açıklamalarını daha iyi anlıyor.
+      // Gemini modelleri ana konunun (subject) prompt'un en başında olmasını tercih eder.
+      // Jenerik stil kelimelerini sonuna ekliyoruz ki ana konu (prompt) kaybolmasın.
       const enhancedPrompt = isIllustration
-        ? `Premium digital illustration, highly detailed, NOT photorealistic. ${prompt}. Aspect ratio: ${aspectRatio} ${orientation}`
-        : `High-quality photorealistic cinematic image, professional lighting, detailed. ${prompt}. Aspect ratio: ${aspectRatio} ${orientation}`;
+        ? `SUBJECT: ${prompt}\n\nINSTRUCTIONS: Generate a premium digital illustration of the EXACT SUBJECT described above. Make it highly detailed and vivid, but NOT photorealistic. Aspect ratio: ${aspectRatio} ${orientation}. DO NOT deviate from the SUBJECT.`
+        : `SUBJECT: ${prompt}\n\nINSTRUCTIONS: Generate a high-quality photorealistic cinematic image of the EXACT SUBJECT described above. Use professional lighting and make it highly detailed. Aspect ratio: ${aspectRatio} ${orientation}. DO NOT deviate from the SUBJECT.`;
 
       // ── Katman 1: gemini-2.5-flash-image (Nano Banana) — 2 deneme ──
       for (let attempt = 1; attempt <= 2; attempt++) {