feat: remove fetch depth limit for dependency resolution

Real package managers (pip, npm, Maven) don't have depth limits - they
resolve the full dependency tree. We have other safeguards:
- Loop prevention via fetch_attempted set
- Timeout via auto_fetch_timeout setting
- Dependency trees are finite

backend/app/routes.py

@@ -7093,7 +7093,6 @@ async def resolve_artifact_dependencies(
                 base_url=base_url,
                 storage=storage,
                 registry_clients=registry_clients,
-                max_fetch_depth=settings.auto_fetch_max_depth,
             )
         else:
             # Fast, synchronous resolution without network calls