Update StudioBridge to v2.1.1
- Replace StudioBridge JAR: 0.0.1-SNAPSHOT -> 2.1.1 (latest upstream release)
- Update StudioBridge.bat to reference new JAR filename
- Update README: full printer list (A1, A1 Mini, P1P, P1S, P2S, X1, X1C,
X1E, X2D, H2C, H2C rev2, H2D, H2D Pro, H2S), Orca Slicer support,
Check Printer feature, CLI arguments, Java 21 requirement
- Add .gitignore excluding portable-dist/jre/ (large binary, not for VCS)
- Bundled JRE upgraded locally to Temurin 21.0.11+10 LTS (not tracked in git)