Review expose-service-publicly doc (#195)
## Summary
- Replace stale inline code listings (fly.toml, Dockerfile, start.sh, nginx.conf, mise tasks, CI workflow) with brief descriptions pointing readers to the actual `fly/` and `mise-tasks/` files — prevents future drift
- Add observability sidecar section documenting the Alloy integration (logs → Loki, metrics → Prometheus)
- Fix broken internal wiki-link (`[[#7. Update Tailscale ACLs if needed]]` → correct heading)
- Update per-service nginx templates to current patterns (deferred DNS resolution via `set $upstream` variable, `proxy_intercept_errors`, error pages)
- Add `cv.eblu.me` to verification steps (live service not previously documented)
- Add `last-reviewed: 2026-02-16` frontmatter
- Net -187 lines (58 added, 245 removed)
## Deployment and Testing
- [x] All pre-commit hooks pass (link validation, frontmatter, filenames)
- [ ] Docs site renders correctly after merge
Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/195
Erich Blume
2c55c2316e