fix: --fast-deps now respects --skip-torch-or-directml

[bigcat88]

When using comfy install --fast-deps --skip-torch-or-directml, the --skip-torch-or-directml flag was silently ignored. The DependencyCompiler had no awareness of this flag and always configured PyTorch index URLs and wrote torch packages into the override file.

Added a skip_torch parameter to DependencyCompiler. When set, it prevents torch/torchvision/torchaudio from being included in the override file and skips adding PyTorch index URLs during installation. The install command now passes skip_torch_or_directml through to DependencyCompiler.

Added tests covering all three aspects: GPU URL/backend nullification across NVIDIA/AMD/CPU, override file content, and install command arguments.

Fixes #246

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
+ Coverage   63.44%   63.92%   +0.47%     
==========================================
  Files          33       33              
  Lines        3699     3703       +4     
==========================================
+ Hits         2347     2367      +20     
+ Misses       1352     1336      -16     

Files with missing lines	Coverage Δ
comfy_cli/command/install.py	72.74% <ø> (ø)
comfy_cli/uv.py	64.02% <100.00%> (+6.36%)	⬆️

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