feat: add telemetry, i18n, governance timelock, and WS relay

[devzubby]

Summary

• Add OpenTelemetry tracing, request and operation Prometheus histograms, and client error reporting. Closes OpenTelemetry Distributed Tracing & Prometheus Metrics Pipeline #508.
• Load i18next namespaces on demand and support Arabic RTL layouts with accessible language switching. Closes Dynamic i18n RTL Layout Engine & Dynamic Namespace Loader #509.
• Enforce a 48-hour queued execution delay and guardian-threshold emergency cancellation in the DAO. Closes Soroban Governance Multi-Sig Timelock Execution Controller #510.
• Relay filtered contract events across instances with Redis Pub/Sub, heartbeats, and a 1,000-subscriber load harness. Closes Redis Pub/Sub Backbone for Multi-Node WebSocket Cluster Relay #511.

Validation

pm run test:server-features (2 passed)

• JavaScript syntax checks and git diff --check passed.
• Frontend build unavailable: interrupted dependency install left Vite absent; npm ci stalled.
• Rust contract checks unavailable: Windows link.exe is not installed.

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