Update comfy_on_disk function to include additional candidate paths for ComfyUI detection

- Added a loop to check for the presence of ComfyUI in specified candidate paths, enhancing the logic for determining if ComfyUI is installed on disk.
- This change improves the accuracy of installation state reporting by expanding the search for ComfyUI binaries.

src/gpu_rent/provision.py

@@ -428,6 +428,7 @@ def comfy_on_disk() -> bool:
         return True
     if override in ("0", "false", "no"):
         return False
+    for cand in (
         Path("/mnt/swarm_data/dlbackend/ComfyUI/venv/bin/python"),
         Path("/mnt/swarm_data/dlbackend/ComfyUI/main.py"),
         Path("/opt/swarmui/dlbackend/ComfyUI/venv/bin/python"),