feat: add JetStream config, limits & validation tests (Task 7)
Port 51 Go-parity tests covering JetStream system config, account limits, tiered limits, storage reservation, strict mode validation, stream create pedantic mode, cluster config validation, and limit lock bugs. Go refs: TestJetStreamAutoTuneFSConfig, TestJetStreamSystemLimitsPlacement, TestJetStreamTieredLimits, TestJetStreamStrictMode, and 20+ more.
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