Increase live calculate integration timeout

[anth-volk]

Fixes #3553

Summary

• Raise the shared live integration httpx.Client timeout from 30 seconds to 90 seconds.
• This gives the synchronous /us/calculate smoke tests enough room for staging latency and cold-start behavior observed in the deploy rerun.

Testing

• python -m pytest tests/integration/test_live_calculate.py --collect-only -q

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.94%. Comparing base (55e4f2f) to head (0d99785).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3554   +/-   ##
=======================================
  Coverage   78.94%   78.94%           
=======================================
  Files          65       65           
  Lines        3762     3762           
  Branches      662      662           
=======================================
  Hits         2970     2970           
  Misses        614      614           
  Partials      178      178           

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