refactor: replace boost::filesystem with std::filesystem in glog_wrapper

[isotauon]

Summary

• Drop boost/filesystem.hpp from src/base/glog_wrapper.h and use std::filesystem::create_directories instead.
• Update src/base/glog_wrapper_test.cc to alias fs = std::filesystem.
• std::filesystem is already the convention in other parts of the project (e.g. src/datacollector/data_collector.h, src/cmd/sql_cmd_test.cc). No behavior change.

Test plan

• glog_wrapper_test passes locally / in CI.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.32%. Comparing base (1d5edd3) to head (cacc656).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4112   +/-   ##
=========================================
  Coverage     75.31%   75.32%           
  Complexity      711      711           
=========================================
  Files           763      763           
  Lines        143738   143738           
  Branches       1537     1480   -57     
=========================================
+ Hits         108252   108266   +14     
+ Misses        35183    35169   -14     
  Partials        303      303           

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