Update go version and libraries

[miiu96]

• Update Go to 1.26, bump Rosetta SDK, implement ConstructionPreprocessOperations endpoint + AllAccountBalances stubs, update CI actions.

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.53%. Comparing base (0ad38b9) to head (cf2a6db).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
server/services/constructionService.go	80.48%	4 Missing and 4 partials ⚠️
server/services/accountService.go	0.00%	2 Missing ⚠️
server/services/offline_services.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
- Coverage   62.65%   57.53%   -5.13%     
==========================================
  Files          48       48              
  Lines        2999     3094      +95     
==========================================
- Hits         1879     1780      -99     
- Misses        968     1170     +202     
+ Partials      152      144       -8     

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