Rewrite DBLab 4.1 blog post with real examples and polished style

- Replace placeholder CLI examples with exact flags from source code
- Add real API request/response JSON from OpenAPI spec
- Add real PromQL queries and alert YAML from PROMETHEUS.md
- Add actual Docker run commands from Colima setup guide
- Add Teleport resource YAML and webhook payload from source
- Add rds-refresh Docker command and real config from example
- Rewrite prose for clarity: lead with concrete scenarios,
  tighten paragraphs, remove redundant "why it matters" headers
- Add edition availability table (CE/SE/EE)

https://claude.ai/code/session_01UjvipgoS6qs1ikzifd77Xi

Author: claude