fix: honor SOCKS5 connection timeout

[mcollina]

Honor connectTimeout across SOCKS5 proxy setup, authentication, CONNECT negotiation, and target TLS upgrades. Forward the option through ProxyAgent, surface standard connect timeout errors, and add focused regression coverage plus synchronized documentation and types.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.90110% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.48%. Comparing base (fc3450d) to head (d1fa1d8).

Files with missing lines	Patch %	Lines
lib/dispatcher/socks5-proxy-agent.js	98.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5733      +/-   ##
==========================================
+ Coverage   93.47%   93.48%   +0.01%     
==========================================
  Files         110      110              
  Lines       38908    38977      +69     
==========================================
+ Hits        36368    36439      +71     
+ Misses       2540     2538       -2     

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