Sync from docs: rename Metrics→Monitoring and Telemetry→Usage Reporting (powersync-docs #499)

[bean1352]

Generated by Claude. Review carefully before merging.\n\nSource docs PR: https://github.com/powersync-ja/powersync-docs/pull/499\n\n### What changed in docs\n\nThe self-hosted docs pages previously titled "Metrics" and "Telemetry" were renamed to "Monitoring" (/maintenance-ops/self-hosting/monitoring) and "Usage Reporting" (/maintenance-ops/self-hosting/usage-reporting) respectively, with redirects added for the old URLs. Wording in several pages was updated to reflect the new framing.\n\n### Skill updates in this PR\n\n- skills/powersync/references/powersync-service.md — Updated the stale [Metrics](…/metrics) link in the Kubernetes Observability section to [Usage Reporting](…/usage-reporting#whatiscollected), matching the updated destination in the docs (the "What is Collected" section on the Usage Reporting page is the actual metric catalog).\n\n### Notes for reviewer\n\n- The old /maintenance-ops/self-hosting/metrics URL still resolves via a redirect, so the skill was not actively broken — but the link text and destination are now misleading. The fix aligns with the updated anchor used in aws-eks.mdx in the docs PR.\n- No other skill files contain references to the old telemetry or metrics page paths.\n- The docs PR also clarified that the "Telemetry" page (now "Usage Reporting") covers anonymous usage metrics sent to PowerSync, not general OpenTelemetry observability. No skill content describes this concept directly, so no further wording changes were needed.

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