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

prisma/schema.prisma

@@ -264,6 +264,8 @@ model Project {
   seoKeywords     String[]      // Hedeflenen SEO anahtar kelimeler
   seoTitle        String?       @db.VarChar(200)
   seoDescription  String?       @db.VarChar(500)
+  seoTitleAlts    String[]      // 5 alternatif SEO başlığı (AI üretimi)
+  seoScore        Int?          // 0-100 arası SEO güç skoru
   seoSchemaJson   Json?         // VideoObject structured data
   socialContent   Json?         // { youtubeTitle, tiktokCaption, instagramCaption, twitterText }
   referenceUrl    String?       @db.VarChar(500)
@@ -297,6 +299,12 @@ model Project {
   mediaAssets     MediaAsset[]
   renderJobs      RenderJob[]
   templateEntry   Template?     @relation("SourceProject")
+  seoScoreHistory SeoScoreHistory[]
+  
+  // Parent-Child relationship for translations and versions
+  parentId        String?
+  parentProject   Project?      @relation("ProjectVersions", fields: [parentId], references: [id])
+  childProjects   Project[]     @relation("ProjectVersions")
   
   // Timestamps & Soft Delete
   createdAt       DateTime      @default(now())
@@ -311,6 +319,25 @@ model Project {
   @@index([createdAt])
 }
 
+// ============================================
+// SEO Score History — Zaman Serisi
+// ============================================
+
+model SeoScoreHistory {
+  id        String   @id @default(uuid())
+  score     Int      // 0-100
+  event     String   @db.VarChar(50) // script_generated, title_changed, seo_titles_regenerated
+  metadata  Json?    // { selectedTitle, keywords, ... }
+  
+  projectId String
+  project   Project  @relation(fields: [projectId], references: [id], onDelete: Cascade)
+  
+  createdAt DateTime @default(now())
+
+  @@index([projectId])
+  @@index([createdAt])
+}
+
 model Scene {
   id              String         @id @default(uuid())
   order           Int            // Sahne sırası (1, 2, 3...)