Add Android VPN-aware DNS resolver#139
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Summary
SetDNSandResetDNSAPIs for configuring Go's process-wide resolverProtectFdcontrollerWhy
Android VPN sessions can expose a loopback DNS endpoint to Go's resolver, causing outbound server hostname resolution to loop back into the TUN. This provides an explicit protected bootstrap resolver for Android without changing other platform artifacts.
Validation
go test ./... -count=1git diff --check