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* Fix DNS probe thread safety and avoid blocking engine sync Refactor ProbeAvailability to prevent blocking the engine's sync mutex during slow DNS probes. The probe now derives its context from the server's own context (s.ctx) instead of accepting one from the caller, and uses a mutex to ensure only one probe runs at a time — new calls cancel the previous probe before starting. Also fixes a data race in Stop() when accessing probeCancel without the probe mutex. * Ensure DNS probe thread safety by locking critical sections Add proper locking to prevent data races when accessing shared resources during DNS probe execution and Stop(). Update handlers snapshot logic to avoid conflicts with concurrent writers. * Rename context and remove redundant cancellation * Cancel first and lock * Add locking to ensure thread safety when reactivating upstream servers