Allow Overriding Notary Network Setting

[Step7750]

Note

Medium Risk
Moderate risk because it changes prover initialization behavior and could affect proving reliability/performance if an invalid or unexpected network_setting is provided; default behavior remains unchanged.

Overview
Allows NotaryProveRequest.meta to optionally specify a network_setting (typed as NetworkSetting) for TLSN proving.

The offscreen prove handler now passes this value into new Prover({ network: ... }), defaulting to 'Latency' when not provided.

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