order includes following the style guide

[manuschneider]

Follows the C++ style guide.

[gemini-code-assist]

Code Review

This pull request reorganizes and cleans up the #include headers across several C++ source files to improve consistency and readability. Standard library headers, third-party library headers, and project-specific headers are now grouped and sorted. There are no review comments to address, and I have no additional feedback to provide.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.49%. Comparing base (9d313f5) to head (e7995cc).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #878   +/-   ##
=======================================
  Coverage   29.49%   29.49%           
=======================================
  Files         241      241           
  Lines       35523    35524    +1     
  Branches    14780    14780           
=======================================
+ Hits        10476    10477    +1     
  Misses      17791    17791           
  Partials     7256     7256           

Flag	Coverage Δ
cpp	29.08% <ø> (+<0.01%)	⬆️
python	52.71% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
C++ backend	30.73% <ø> (+<0.01%)	⬆️
Python bindings	17.09% <ø> (ø)
Python package	52.71% <ø> (ø)

Files with missing lines	Coverage Δ
src/BlockFermionicUniTensor.cpp	32.76% <ø> (ø)
src/BlockUniTensor.cpp	37.26% <ø> (ø)
src/DenseUniTensor.cpp	50.22% <ø> (ø)
src/Network.cpp	0.00% <ø> (ø)
src/Network_base.cpp	0.00% <ø> (ø)
src/RegularNetwork.cpp	35.68% <ø> (+0.11%)	⬆️
src/UniTensor_base.cpp	27.86% <ø> (ø)
src/backend/Storage_base.cpp	21.05% <ø> (ø)
src/stat/histogram.cpp	0.00% <ø> (ø)

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