Refactor: remove duplicate initialize(mFrequencies) calls and migrate SVC to CompositePowerComp (#508)

[leonardocarreras]

Summary

• Remove duplicate ->initialize(mFrequencies) calls from createSubComponents() and initializeParentFromNodesAndTerminals() in 13 composite component files; CompositePowerComp::initializeFromNodesAndTerminals() already calls this for every registered sub-component, making the earlier calls redundant
• Migrate DP_Ph1_SVC from the old MNASimPowerComp pattern to CompositePowerComp, matching the pattern introduced by fix: virtual node ordering for composite components (#270) #496; adds the missing hasParameterChanged() override required by MNAVariableCompInterface and fixes pre-existing signature mismatches

Closes #508.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.34%. Comparing base (51ab0e4) to head (e7234bc).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #511      +/-   ##
==========================================
- Coverage   67.38%   67.34%   -0.05%     
==========================================
  Files         426      426              
  Lines       26037    25991      -46     
  Branches    13246    13217      -29     
==========================================
- Hits        17546    17504      -42     
+ Misses       8490     8440      -50     
- Partials        1       47      +46     

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[georgii-tishenin]

Hi @leonardocarreras. The refactoring looks good to me.