Simplify conversation naming to truncate first message

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blueprints/conversation/models.py

@@ -1,5 +1,4 @@
 import enum
-from dataclasses import dataclass
 
 from tortoise import fields
 from tortoise.contrib.pydantic import (
@@ -9,12 +8,6 @@ from tortoise.contrib.pydantic import (
 from tortoise.models import Model
 
 
-@dataclass
-class RenameConversationOutputSchema:
-    title: str
-    justification: str
-
-
 class Speaker(enum.Enum):
     USER = "user"
     SIMBA = "simba"