docs: update TPCC benchmark results

[KKould]

Summary

• refresh the 720-second TPCC comparison with the latest release-run results
• update the detailed transaction summaries and latency histograms
• use the SQLite-only rerun results for the SQLite rows

Validation

• git diff --check
• README detail blocks verified against the raw benchmark logs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.74%. Comparing base (dec3643) to head (bd0036f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #373   +/-   ##
=======================================
  Coverage   92.74%   92.74%           
=======================================
  Files         243      243           
  Lines       41025    41025           
=======================================
  Hits        38049    38049           
  Misses       2976     2976           

Flag	Coverage Δ
rust	92.74% <ø> (ø)

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