Pavel Punsky 69bc0e7351 Load generator mode in turnutils_uclient (#1894) ...

## Summary

Adds load-generator modes to `turnutils_uclient` for repeatable TURN
server performance testing:

- Adds `-Y packet|alloc|invalid` load modes.
- Supports packet flood, allocation flood, and invalid-packet flood
workflows.
- Adds unique local client ports for allocation flood mode.
- Removes default packet pacing in load-generator modes unless
explicitly set.
- Adds helper scripts under `examples/loadtest/`.
- Documents load-test usage in `README.turnutils`,
`man/man1/turnutils.1`, `CLAUDE.md`, and
`docs/PerformanceIterationLog.md`.

The performance log captures DigitalOcean benchmark methodology, A/B
lessons, hot-path findings, and future optimization candidates.

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..

allocation_flood.sh

Load generator mode in turnutils_uclient (#1894)

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invalid_flood.sh

Load generator mode in turnutils_uclient (#1894)

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packet_flood.sh

Load generator mode in turnutils_uclient (#1894)

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