fix: auto-completion of arch role and default SSH initialization in single-node mode

[LZiHaN]

This PR has the following changes:

• fix apply single-mode miss arch role.
• default SSH initialization in single-node mode.

refer to #3051

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.67 🎉

Comparison is base (8f94803) 72.30% compared to head (6da5806) 72.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3102      +/-   ##
==========================================
+ Coverage   72.30%   72.97%   +0.67%     
==========================================
  Files           8        8              
  Lines         603      618      +15     
==========================================
+ Hits          436      451      +15     
  Misses        132      132              
  Partials       35       35              

Impacted Files	Coverage Δ
pkg/apply/apply.go	75.00% <100.00%> (-3.05%)	⬇️
pkg/apply/utils.go	91.66% <100.00%> (+2.19%)	⬆️

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