Correct SETUP.md: Docs belongs on the status page; refresh the Kuma audit

[mathewcsims]

What

• Removes the claim (introduced in Add organice at org.mathewcsims.uk, backed by a new copyparty WebDAV volume #61) that the Docs monitor is "deliberately NOT on the page" — Mathew never agreed to that exclusion, and it misled the 2026-08-09 tagging pass into initially skipping Docs when adding the new monitors to the status page. The section now states every active monitor belongs on the page, and that any future intentional exclusion must be recorded with provenance.
• Updates the monitoring audit to current reality: 29 active monitors, all 29 on the all status page (Docs added live 2026-08-09), Docs/Fizzy/Super Productivity recorded as the latest tag-convention drift (caught and tagged 2026-08-09).
• Adds the Eddie host tag (sky blue #0284C7) to the tag-conventions list, which previously stopped at Slartibartfast.

Live changes this documents (already applied via Socket.IO, not part of this diff)

• Monitors 36/38/39 (Docs, Fizzy, Super Productivity) tagged Homelab + Heart of Gold.
• All three added to the all page's Services group in case-insensitive alphabetical order.
• Verified: untagged-monitor SQL check on babel returns empty; public /api/status-page/all shows 17/8/4 monitors across the three groups.

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