fix(sno-allow-customize-registry-api-url): read env

[snomiao]

Allow read registry api url from env e.g. COMFY_REGISTRY_API=https://staging-api.comfy.org

if you want use this pr before merge:
pip install https://github.com/Comfy-Org/comfy-cli/archive/sno-allow-customize-registry-api-url.zip

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
+ Coverage   48.07%   48.12%   +0.05%     
==========================================
  Files          30       30              
  Lines        3070     3073       +3     
==========================================
+ Hits         1476     1479       +3     
  Misses       1594     1594              

Files with missing lines	Coverage Δ
comfy_cli/registry/api.py	90.16% <100.00%> (+0.50%)	⬆️

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[snomiao]

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