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Dev Scribe
b0408e4d1c
Internal Domains now support three modes. "os" is unchanged. "resolvers" becomes explicit resolver with network fallback: the configured resolvers are tried first, and a timeout, unreachable resolver, SERVFAIL or NXDOMAIN hands the query to matching VPN DNS servers, then domain-less VPN DNS servers, then the OS resolver's LAN nameservers through the new LanOnlyQueryCtx. "resolvers_only" keeps the previous strict behavior. Down fallback-mode resolvers are skipped and re-checked in the background at most every 30s. Generated upstreams are identified by the UpstreamConfig.InternalDomain marker instead of the internal_ key prefix. Master adaptations: the fallback state lives on proxyRequest and is applied in tryUpstreams, shouldContinueWithNextUpstream and handleAllUpstreamsFailure instead of v1.0's monolithic proxy loop. Resolver construction uses master's context-aware NewResolver, and the background re-check marks its context private so transport errors that name the resolver stay at debug. Tests use master's zap JSON capture and VPN manager logger.
