Transition telemetry dashboard integration from an external URL approach to a local reverse proxy via Nginx. This simplifies client-side connectivity by routing all telemetry requests through the existing web server's domain.
- Configure Nginx to proxy `/telemetry/` sub-paths to the internal telemetry service
- Implement `sub_filter` in Nginx to rewrite root-relative paths for the SPA
- Remove `VITE_TELEMETRY_URL` build arguments and environment variable dependencies
- Simplify `TelemetryPage` to use a relative `/telemetry` base path
- Clean up deployment workflows and Dockerfile by removing unused telemetry build args
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