Update admin_routes.py

admin_routes.py

@@ -119,8 +119,8 @@ class ProjectUpdate(BaseModel):
     last_update_date: str
 
 class VersionCreate(BaseModel):
-    source_version_id: int
     caption: str
+    source_version_id: int | None = None    # None → boş template
 
 class IntentModel(BaseModel):
     name: str