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* [relay] evict foreign client cache on disconnect When a foreign relay's TCP connection drops, the manager's onServerDisconnected handler only triggered reconnect logic for the home server; the disconnected foreign entry stayed in the relayClients cache. Subsequent OpenConn calls reused the closed client until the 60-second cleanup tick evicted it, breaking peer connectivity through that relay for up to a minute. Evict the foreign entry from the cache on disconnect so the next OpenConn dials a fresh client. Also: - Make the reconnect backoff cap configurable via WithMaxBackoffInterval ManagerOption; the previous hard-coded 60s constant forced TestAutoReconnect to sleep ~61s. Test now polls Ready() and finishes in ~2s. - Add NB_HOME_RELAY_SERVERS env var that overrides the relay URL list received from management, so a peer can be pinned to a specific home relay (used by the netbird-conn-lab Edge 4 reproducer). * [client] treat empty NB_HOME_RELAY_SERVERS as unset Returning (urls=[], ok=true) when the env var contained only separators or whitespace caused callers to wipe the mgmt-provided relay list, leaving the peer with no relays. Treat a parsed-empty result the same as an unset env.