fix: correct bash syntax for memory floors (SC1036) (#60)

* feat(bedrock): add systemd hardening; docs: drop Debian 11 badge; add COPILOT_RUN_INSTRUCTIONS pointer

* fix(setup): correct bash syntax for memory floors; enforce Xmx≥2G and Xms≥1G (fixes SC1036)

Java 21 default, Corretto fallback, JVM autosizing, Bedrock checksum,…

… systemd hardening

Java 21 refactor + hardening

Merge pull request #28 from TimInTech/chore/audit-minor-fixes

Chore/audit minor fixes

Fix Bedrock URL, auto-create minecraft user, CT helper, networking docs

Merge pull request #7 from TimInTech/codex/check-and-improve-file-upl…

…oad-issues

Fix shellcheck warnings

Update README.md

Update update.sh

feat: add dynamic PaperMC update.sh with API-based version & build resolution

- Uses PaperMC API to fetch latest version and build
- Replaces existing server.jar in /opt/minecraft
- Includes status output after update
- Designed for standalone use by minecraft user