Add DiscoveryLastFM

[MrRobotoGit]

To ensure your Pull Request is dealt with swiftly, please check the following (check the boxes [x]):

• Submit one item per pull request. This eases reviewing and speeds up inclusion.
• You have searched the repository for any relevant issues or PRs, including closed ones.
• Any software you are adding is not already listed at any of awesome-sysadmin, staticgen.com, staticsitegenerators.bevry.me, dbdb.io.
• The file you are adding is formatted as described in addition.md.
• Comments and unused optional fields have been removed.
• The file you are adding uses kebab-case file naming (discoverylastfm.yml).
• Values for platform match the platforms required to install and run the software (Python, Docker).
• Any software project you are adding to the list is actively maintained.
• Any software project you are adding was first released more than 4 months ago (first release 2025-06-22).
• Any software project you are adding has working installation instructions (Docker quick-start and manual installation both documented).
• You understand that your Pull Request will be merged at least ~1 week after approval, depending on maintainers time.