feat: expose primary profile confirmation

[luoshuijs]

Summary

• advertise and verify primary-profile confirmation support in the Mihomo platform adapter used by account-center orchestration
• add service-level coverage for the confirm-primary-profile path and its ticket validation behavior

Test Plan

• pwsh -File "scripts/integration.ps1" test
• go test ./internal/service

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.93%. Comparing base (88ef7b1) to head (2313b84).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   27.86%   27.93%   +0.06%     
==========================================
  Files          27       27              
  Lines        2950     2950              
==========================================
+ Hits          822      824       +2     
+ Misses       1998     1997       -1     
+ Partials      130      129       -1     

Flag	Coverage Δ
unit	27.93% <100.00%> (+0.06%)	⬆️

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