Guide to observing a solution in production #100

The docs show telemetry in the local Aspire dashboard and stop there. An engineer shipping the container needs to send traces, metrics and logs to a real backend and know what to look at.

Phase 1: The guide

• guides/observe-in-production.mdx per template: point OTEL_EXPORTER_OTLP_ENDPOINT at a backend (any OTLP collector, with Grafana, Honeycomb and Azure Monitor as examples), what each span and log carries, and the health checks
• Lambda: CloudWatch and X-Ray instead

Checks: the site builds, and the settings match configuration-and-environments and telemetry in each template.