Fix: prevent Go runtime init in FPM master during opcache.preload

[PopoviciMarian]

When opcache.preload is configured under php-fpm, the master runs a virtual RINIT for the preload script before forking workers. That used to dlopen Aikido's Go request-processor in the master, spawning Go's scheduler/GC/netpoll kernel threads there. fork() only clones the calling thread, so workers inherited a Go runtime whose internal tables pointed at threads that didn't exist in their address space.

Summary by Aikido

Security Issues: 0	Quality Issues: 0	Resolved Issues: 0

🐛 Bugfixes

• Added IsRequestHandledInMainPid method to detect opcache.preload master RINIT.
• Short-circuited AST, handler, and compilation paths when master handled requests.

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