perf worker: LibMP performance reports from Street Soccer Pro clients and servers

ingest (INGEST_TOKEN)
  POST /v1/reports                 report json -> { id, issues, upload }
  PUT  /v1/reports/:id/snapshot    raw MicroProfiler snapshot (x-snapshot-encoding: zstd | none)

read (READ_TOKEN; add ?format=text or Accept: text/plain for terminal output)
  GET  /v1/reports                 since side reason version user job device scene region issue raw=1 limit before
  GET  /v1/reports/:id             full summary, context and fresh diagnosis
  GET  /v1/reports/:id/snapshot    raw snapshot bytes
  GET  /v1/issues                  issue counts and share of reports
  GET  /v1/stats?by=version|device|region|scene|reason|quality|side|day
  GET  /v1/systems                 ECS system cost across reports (list=systems|phases)
  GET  /v1/scopes                  engine scope cost across reports (list=main|workers|gpu)
  GET  /v1/servers                 server memory growth per job (leak suspects)
  GET  /v1/servers/:job            one server's report timeline
  GET  /v1/compare?a=V&b=V         version regression check
  POST /v1/render                  { side, summary, context } -> diagnosis without storing