[Doc] perf REPORT.md template + first baseline

[moligarch]

Phase

P1

Summary

Create a standardized template for all future performance reports. Use this new template to document the 1k rps baseline test of the policy-orchestrator.

Where to put it

/docs/perf/REPORT.md

Extras: attach flamegraphs/screens

Checklist / Extras

• Template includes sections for Environment, Methodology, Scenarios, Metrics, and Conclusions.
• Baseline orchestrator test results are filled in.
• Added screenshots/flamegraphs from the baseline test.