feat: Enhance file retrieval logging by including request ID for improved traceability

[OscarZhou0107]

add request id for debugging

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.63636% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 54.99%. Comparing base (376db54) to head (4471807).
Report is 3 commits behind head on main.

Files	Patch %	Lines
server/src/server.rs	52.38%	9 Missing and 1 partial ⚠️
server/src/cache.rs	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   54.60%   54.99%   +0.38%     
==========================================
  Files          11       11              
  Lines        1216     1242      +26     
  Branches     1216     1242      +26     
==========================================
+ Hits          664      683      +19     
- Misses        480      486       +6     
- Partials       72       73       +1     

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