feat(p7-02): fill opts_test.go stubs — ServerOptionsTests
Write 3 unit tests portable without a running server:
- ListenMonitoringDefault (T:2524): SetBaselineOptions propagates Host → HttpHost
- GetStorageSize (T:2576): StorageSizeJsonConverter.Parse K/M/G/T suffixes
- ClusterNameAndGatewayNameConflict (T:2571): ValidateOptions returns ErrClusterNameConfigConflict
Mark 74 opts_test.go stubs deferred: tests require either the NATS
conf-format parser (not yet ported), a running server (RunServer/NewServer),
or CLI flag-parsing infrastructure (ConfigureOptions).
Fix StorageSizeJsonConverter.Parse to return 0 for empty input,
matching Go getStorageSize("") == (0, nil).
Total unit tests: 638 passing.
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