Add StatLite to monitoring tools - #1312

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Adds StatLite to the Monitoring section - a lightweight, self-hosted monitoring dashboard for Spring Boot Actuator applications with SQLite storage.

Summary by cubic

Adds StatLite to the Monitoring section of README_SOURCE.md as a self-hosted monitoring dashboard with direct Spring Boot Actuator/Micrometer and Quarkus integrations, SQLite storage, and no Prometheus or Grafana required.

^{Written for commit 27cfada. Summary will update on new commits.}