[PT1-156] Remove deprecated networks: fantom, aurora, klaytn

[zZoMROT]

Static Code Analysis (readability, compactness):

Clear and concise - removes unused code, improves maintainability.

Dynamic Code Analysis (external APIs, interaction flows):

No way to use fantom, aurora, klaytn networks because it was deprecated.

Efficiency (gas costs, computational complexity, memory requirements):

Slight improvement - less config overhead, lower memory footprint.

Opinion, trade-offs and other thoughts (optional):

Good cleanup, no downsides.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (fbfa127) to head (f9ed0ac).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #200   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          346       346           
  Branches        65        65           
=========================================
  Hits           346       346           

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