Fixes

[aldas]

• Mark timeout middleware as deprecated
• fixes/improvements for things that Claude and Codex analysis found

[codecov]

Codecov Report

❌ Patch coverage is 73.91304% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.75%. Comparing base (f24aaff) to head (6356b0b).
⚠️ Report is 35 commits behind head on master.

Files with missing lines	Patch %	Lines
middleware/proxy.go	50.00%	2 Missing and 2 partials ⚠️
middleware/body_limit.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2852      +/-   ##
==========================================
+ Coverage   93.25%   93.75%   +0.50%     
==========================================
  Files          39       40       +1     
  Lines        4652     3954     -698     
==========================================
- Hits         4338     3707     -631     
+ Misses        218      141      -77     
- Partials       96      106      +10     

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