merge pr165 optimize rate_limiter() two fixs

[maverick123123]

perf: optimize rate_limiter() by caching limits
rate_limiter() is called on every kernel launch when pidfound==1.
It was performing 3 shared memory reads, 1 shared memory write, and
2 ensure_initialized() calls before reaching the actual rate-limiting
CAS loop — all unnecessary per-call overhead.

Changes:

• Cache sm_limit and utilization_switch in static locals during
  init_utilization_watcher(). These values are set at container
  startup and do not change at runtime.
• Use cached values for the fast-exit check instead of reading from
  shared memory on every call. When limiting is inactive (sm_limit

  = 100 or == 0), rate_limiter becomes a single branch on a local
  variable.

[hami-robot]

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