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/api/routes/generate_v2.py

@@ -36,6 +36,13 @@ class GenerateV2Request(BaseModel):
     max_attempts: int = Field(default=2, ge=1, le=5, description="Máximo intentos de regeneración")
 
 
+class ThreadPost(BaseModel):
+    """Un post individual de un hilo."""
+    number: int
+    content: str
+    char_count: int
+
+
 class GenerateV2Response(BaseModel):
     """Respuesta de generación v2."""
     success: bool
@@ -47,6 +54,9 @@ class GenerateV2Response(BaseModel):
     attempts: int = 1
     metadata: Optional[Dict[str, Any]] = None
     error: Optional[str] = None
+    # Campos específicos para hilos
+    is_thread: bool = False
+    thread_posts: Optional[List[ThreadPost]] = None
 
 
 class BatchGenerateV2Request(BaseModel):
@@ -142,15 +152,26 @@ async def generate_content_v2(
                 max_attempts=request.max_attempts
             )
 
+            # Detectar si es un hilo
+            is_thread = result.get("is_thread", False)
+            thread_posts = None
+
+            if is_thread and result.get("thread_posts"):
+                thread_posts = [
+                    ThreadPost(**post) for post in result["thread_posts"]
+                ]
+
             return GenerateV2Response(
                 success=True,
                 content=result["content"],
-                adapted_content=result["content"],  # Ya está adaptado
+                adapted_content=result["content"],  # Para hilos, no truncar
                 quality_score=result.get("quality_score"),
                 score_breakdown=result.get("score_breakdown"),
                 is_top_quality=result.get("is_top_performer", False),
                 attempts=result.get("attempts", 1),
-                metadata=result.get("metadata")
+                metadata=result.get("metadata"),
+                is_thread=is_thread,
+                thread_posts=thread_posts
             )
         else:
             result = await generator._v2.generate(
@@ -163,11 +184,22 @@ async def generate_content_v2(
                 personality=request.personality
             )
 
+            # Detectar si es un hilo
+            is_thread = result.get("is_thread", False)
+            thread_posts = None
+
+            if is_thread and result.get("thread_posts"):
+                thread_posts = [
+                    ThreadPost(**post) for post in result["thread_posts"]
+                ]
+
             return GenerateV2Response(
                 success=True,
                 content=result["content"],
                 adapted_content=result["adapted_content"],
-                metadata=result["metadata"]
+                metadata=result["metadata"],
+                is_thread=is_thread,
+                thread_posts=thread_posts
             )
 
     except Exception as e: