fix: add missing command files and register set-language command

docs: correct VSCode extension name to SwiftScript

docs: add publisher name to VSCode extension information

docs: update VSCode extension status to Released and add marketplace link

docs: update VSCode extension status and add user guide links

feat: prepare VSCode extension v0.2.0 for marketplace release

docs: add troubleshooting guide for extension installation

feat: add extension icon and repackage

docs: add English user guide for VSCode extension

docs: add comprehensive user guide for VSCode extension

chore: package VSCode extension to .vsix file

chore: prepare extension for packaging

fix: correct all documentation file paths in README files

fix: correct remaining COMMANDS.md links in README_EN.md

fix: correct COMMANDS.md file paths in README files