Fix:streamdiffusion custom node build, dependencies conflict issue

[RUFFY-369]

Changes made on top of PR #488

[eliteprox]

I think this should be kept at torch 2.8.0. Given there might be cases were we need different torch versions or constraints per "nodes.yaml". I think we should try to avoid downgrading it.

constraints.txt is currently installed early in Dockerfile.base builds and would need modified here

comfystream/docker/Dockerfile.base

Line 92 in 598afc6

RUN conda run -n comfystream --cwd /workspace/comfystream --no-capture-output pip install -r src/comfystream/scripts/constraints.txt

setup_nodes.py would also need refactoring to support a dynamic constraints file

comfystream/src/comfystream/scripts/setup_nodes.py

Lines 63 to 66 in 598afc6

	# Get the absolute path to constraints.txt
	constraints_path = Path(__file__).parent / "constraints.txt"
	if not constraints_path.exists():
	print(f"Warning: constraints.txt not found at {constraints_path}")

I've also considered supporting multiple torch versions using optional deps in comfystream or refactoring to use uv which supports env vars for the constraints file. Any ideas on how to make this more flexible?