fix(lsp monaco): avoid runtime and bundling errors on Monaco and LSP

[Danielku15]

Issues

Fixes #2829

Proposed changes

Refactoring the LSP and Monaco imports/exports to have separate paths for Browser and Node based usage. Root cause is that vscode-languageserver reorganized their package exports to have clear node and browser entry points.

We now follow the same pattern.

Checklist

• I consent that this change becomes part of alphaTab under its current or any future open source license
• This PR is linked to an accepted issue (see above)
• Changes are implemented
• New tests were added
• I have read AGENTS.md if an AI helped draft any part of this PR

AI authorship disclosure

• No AI agent authored any part of this PR (description, code, tests, or commit messages)
• An AI agent contributed to this PR. The AI-authored disclosure block
  (alphatab-ai-authored-v1) is present at the top of this body, and I have
  personally reviewed every change and can explain each one

Further details

• This is a breaking change
• This change will require update of the documentation/website