feat: implement pseudocode parser

[vicho1822]

Pull Request

What does this PR introduce?

This PR introduces the implementation of the pseudocode parser.

Scope of change

Select the affected area(s):

• Builder (Markdown → HTML)
• Pseudocode Lexer
• Pseudocode Parser / AST
• Interpreter / Runtime
• Debugger (step execution)
• CLI
• Documentation
• Tests

Code Quality Checklist

Please confirm that you have followed the project's quality standards:

• I have run npm run lint, npm run format and fixed any errors.
• I have run ruff check --fix . and ruff format ..
• My commit messages follow the Conventional Commits format.

How has this been tested?

• Manual testing
• Unit tests added/updated
• Existing tests pass
• Verified generated HTML output
• Verified step-by-step debugger behavior

Explain briefly what was tested.

We tested the parser to ensure it was working correctly. All the arithmetic operations work as they should, the parser allows you to debug the pseudocode step by step.

Breaking changes?

• No
• Yes (explain below)

Additional notes

N/A

[daniqss]

lgtm