feat: Add proper thread handling in content generation

- Detect threads by template name and skip platform truncation
- Parse thread content into individual posts with numbering
- Add thread_posts array to API response with post details
- Evaluate quality on first post (hook) for threads
- Add is_thread and thread_posts fields to GenerateV2Response

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/content_generator.py

@@ -630,6 +630,7 @@ Responde SOLO con el contenido adaptado."""
 
         attempt = 0
         temperature = 0.7
+        is_thread = template_name == "thread"
 
         while attempt < max_attempts:
             attempt += 1
@@ -643,36 +644,59 @@ Responde SOLO con el contenido adaptado."""
                 temperature_override=temperature
             )
 
-            content = result["adapted_content"]
+            # Para hilos, usar contenido original (no truncado)
+            if is_thread:
+                content = result["content"]
+            else:
+                content = result["adapted_content"]
 
-            # Evaluar calidad
-            quality = await self._validator.evaluate(content, platform)
+            # Evaluar calidad (para hilos, evaluar solo el primer post como muestra)
+            content_to_evaluate = content
+            if is_thread and result.get("thread_posts"):
+                # Evaluar el hook (primer post) como indicador de calidad
+                first_post = result["thread_posts"][0]["content"]
+                content_to_evaluate = first_post
+
+            quality = await self._validator.evaluate(content_to_evaluate, platform)
 
             # Si pasa, retornar
             if quality.final_decision == "accept":
-                return {
+                response = {
                     "content": content,
                     "quality_score": quality.scoring.total_score if quality.scoring else None,
                     "score_breakdown": quality.scoring.breakdown if quality.scoring else None,
                     "is_top_performer": quality.scoring.is_top_performer if quality.scoring else False,
                     "attempts": attempt,
-                    "metadata": result["metadata"]
+                    "metadata": result["metadata"],
+                    "is_thread": is_thread,
                 }
 
+                # Agregar posts del hilo si aplica
+                if is_thread:
+                    response["thread_posts"] = result.get("thread_posts", [])
+
+                return response
+
             # Si debe regenerar, aumentar temperature
             temperature = min(1.0, temperature + 0.1)
 
         # Si llegamos aquí, usar el último intento aunque no sea ideal
-        return {
+        response = {
             "content": content,
             "quality_score": quality.scoring.total_score if quality.scoring else None,
             "score_breakdown": quality.scoring.breakdown if quality.scoring else None,
             "is_top_performer": False,
             "attempts": attempt,
             "metadata": result["metadata"],
-            "warning": "Contenido aceptado después de máximos intentos"
+            "warning": "Contenido aceptado después de máximos intentos",
+            "is_thread": is_thread,
         }
 
+        if is_thread:
+            response["thread_posts"] = result.get("thread_posts", [])
+
+        return response
+
     async def save_to_memory(
         self,
         db: Session,